Best - Taking some liberties here because it's one of the best free agency signings ever: QB Kurt Warner (2005). Signed to one-year contract, Warner beat first-round draft pick Matt Leinart for starting job and led franchise to its first Super Bowl, a near-win against Pittsburgh in 2008 season.

Worst - ILB Stewart Bradley (2011) signed five-year, $30 million deal, but couldn't adapt to 3-4 system. In two seasons, he had 37 tackles in 32 games, and was released last week.

(Associated Press)

Best - RB Michael Turner (2008) was key to five straight winning seasons and had three seasons with at least 1,300 yards rushing and at least 10 TDs every year.

Worst - DE Ray Edwards (2011) signed five-year, $30 million deal with $11 million guaranteed and was released last November.

(Associated Press)

Best - RB Mike Tolbert (2012) came from San Diego and gained 449 yards from scrimmage and had seven TDs despite playing in crowded backfield.

Worst - K Olindo Mare (2011) got four-year, $12 million contract, including a $4 million signing bonus, and lasted one year before being cut

(Associated Press)

Best - DE Julius Peppers (2010) made huge splash when he signed six-year contract. All he's done is make Pro Bowl all three seasons while anchoring strong defense.

Worst - WR Sam Hurd (2011) played offense and special teams for 12 games, but season ended with an arrest on federal drug charges.

(Associated Press)

Best - LB Keith Brooking (2009) was two-year starter and played all 48 games over three seasons, including Cowboys' only playoff victory in past 17 years. Also was mentor for rising star Sean Lee.

Worst - DE Kenyon Coleman (2011) made just 35 tackles and one sack in 23 games over two years before his 2012 season ended with torn triceps muscle.

(Associated Press)

Best - LB Stephen Tulloch (2010), whose first season in Detroit went so well he was signed to five-year contract. Tulloch led Lions in tackles both seasons.

Worst - WR Bryant Johnson (2009) signed three-year contract and didn't make it to third year. Wound up on non-football injury list after crashing golf cart.

(Associated Press)

Best - Packers don't do much in free agency and last true impact players were signed in 2006, DB Charles Woodson and DT Ryan Pickett. Woodson, of course, was All-Pro and 2009 NFL Defensive Player of Year.

Worst - Jeff Saturday (2012) was praised for his locker room leadership, but struggled to adjust to new team and new conference. Lost his starting job with two games left in season.

(Associated Press)

Best - FB Jerome Felton (2012) made Pro Bowl on bargain one-year contract after helping pave way for Adrian Peterson's 2,097 yards rushing.

Worst - WR Bernard Berrian (2008) got six-year, $42 million deal with $16 million guaranteed, had solid first season, then slumped and was cut halfway into 2011 schedule.

(Associated Press)

Best - RB-KR Darren Sproles (2011) signed for relative bargain price of $14 million over four years and has been record-setter as runner-receiver-returner.

Worst- C Olin Kreutz (2011) was signed to fill the void left by Jonathan Goodwin's departure. Kreutz struggled with a blocking scheme and retired four games into season.

(Associated Press)

Best - S Antrel Rolle (2010) has been leader off field, also led Giants in tackles in Super Bowl season and was second in 2010 and '12. Has played CB and safety.

Worst - S C.C. Brown (2009) was signed for $1 million, became starter after Kenny Phillips hurt knee and was lost for season. Brown was benched late in '09 after giving up big plays, earning nickname "Can't Cover."

(Associated Press)

Best - Evan Mathis (2011) signed one-year deal for about $2 million, won job at left guard, then re-signed for five years, $25 million.

Worst - CB Nnamdi Asomugha (2011) signed five-year, $60 million contract, $24 million guaranteed, and has been a flop, often victimized in single coverage.

(Associated Press)

Best - CB Cortland Finnegan (2012) grabbed five-year, $50 million contract, made impact plays early in season and helped improve locker room culture.

Worst - WR Drew Bennett (2007) got a six-year contract in 2007, caught 34 passes in two seasons.

(Associated Press)

Best - DE Justin Smith (2008) emerged as menacing force and All-Pro after signing six-year contract. Team leader and inspirational player for NFC champs.

Worst - RB Brandon Jacobs (2012) left Super Bowl champion Giants, injured knee early, mouthed off, was suspended and then released after five carries for 7 yards.

(Associated Press)

Best - Marshawn Lynch (2012). Asterisk here: Lynch never truly got to free agency as he signed new contract ($31 million, four years) with Seattle before it began last year. Then had career-high 1,590 yards rushing and 11 touchdowns in 2012.

Worst - WR T.J. Houshmandzadeh (2009) caught 79 passes for 911 yards in one season with Seattle, but work ethic and attitude didn't mesh with Pete Carroll when he took over in 2010.

(Associated Press)

Best - WR Vincent Jackson (2012) signed five-year, $55.55 million deal, had best overall season of career with 72 receptions, 1,384 yards and eight TDs. His 19.2 yards per catch was among best in league and he made Pro Bowl.

Worst - K Mike Nugent (2009) signed for one year, $2 million despite missing most of 2008 with Jets because of leg injury. Lasted four games, missing first four FGs and going 2 for 6.

(Associated Press)

Best - WR Pierre Garcon (2012) signed five-year, $42.5 million deal and had only half-season of output. But what a half-season as major cog in seven-game winning streak to win NFC East.

Worst - DT Albert Haynesworth (2009) was guaranteed then-record $41 million in seven-year, $100 million contract. Played only two seasons in Washington, the second as backup after needing several attempts to pass training camp conditioning test.

(Associated Press)