PS 5/10 semibluff push on the turn

[r3vbr]

Oponent (button) is weak-tight (vpip 17 pfr 2)
no specific reads..
what do you think of MPB's play.

PokerStars No-Limit Hold'em, $10 BB (8 handed) converter

BB ($487)
UTG ($888.75)
UTG+1 ($1122)
MP1 ($993)
MPB ($1000)
CO ($2203)
Button ($789)
SB ($990)

Preflop:
<font color="#666666">3 folds</font>, <font color="#CC3333">MPB raises to $40</font>, <font color="#666666">1 fold</font>, Button calls $40, <font color="#666666">2 folds</font>.

Flop: ($95) 9[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MPB bets $60</font>, Button calls $60.

Turn: ($215) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
MPB checks, <font color="#CC3333">Button bets $120</font>, <font color="#CC3333">MPB raises to $600</font>, Button calls $480.

River: ($1415) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MPB bets $90</font>, Button calls $89 (All-In).

Final Pot: $1594

Results in white below: <font color="#FFFFFF">
MPB has 5d 4d (one pair, fours).
Button has Ks As (flush, ace high).
Outcome: Button wins $1593. MPB wins $1. </font>