50NL Limped pot, TP + NFD, purposely passive

[Effen]

I like to mix it up every so often especially against relatively aggressive opponents. His line is 55 or nothing here, or am I off?

Does anyone else do this randomly?

PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG+1 ($93.75)
MP1 ($48.50)
MP2 ($50)
CO ($55.15)
Button ($45.50)
Hero ($49.50)
BB ($88.45)
UTG ($48.20)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls $0.50, <font color="#666666">3 folds</font>, Hero completes, BB checks.

Flop: ($1.50) Q[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $1</font>, BB calls $1, <font color="#CC3333">MP1 raises to $4</font>, Hero calls $3, BB folds.

Turn: ($10.50) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets $7</font>, Hero calls $7.

River: ($24.50) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets $11</font>, Hero calls $11.

Final Pot: $46.50