Gigabet river play

[Foucault]

I thought this was an interesting hand because it is a spot where I'd be too afraid to raise for value, with the flush on the board. What do you think of the raise? Of the call?

PokerStars No-Limit Hold'em Tourney, Big Blind is t200 (9 handed) converter

Hero (t3155)
MP2 (t3415)
MP3 (t4140)
CO (Gigabet) (t9445)
Button (t1700)
SB (t4655)
BB (t3855)
UTG (t895)
UTG+1 (t3195)

Preflop: Gigabet is CO with 7[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">5 folds</font>, CO calls t200, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (t600) 6[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets t400</font>, BB folds, CO calls t400.

Turn: (t1400) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, CO checks.

River: (t1400) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t800</font>, <font color="#CC3333">CO raises to t2000</font>, <font color="#CC3333">SB raises to t4055</font>, CO calls t2055.

Final Pot: t9510