KK uncertainty (do I value bet?)

[chris_a]

Party Poker 0.5/1 Hold'em (9 handed) converter

Preflop: Hero is MP3 with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img].
UTG calls, UTG+1 calls, MP1 folds, MP2 calls, <font color="#CC3333">Hero raises</font>, CO folds, Button folds, SB folds, BB <font color="#A500AF">(Super-LAG)</font> calls, UTG calls, UTG+1 calls, MP2 calls.

Flop: (10.50 SB) 5[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
Super-LAG checks, UTG checks, UTG+1 checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">Super-LAG 3-bets</font>, UTG folds, UTG+1 calls, MP2 calls, Hero calls.

Turn: (11.25 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Super-LAG checks, UTG+1 checks, MP2 checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Super-LAG raises</font>, UTG+1 folds, MP2 folds, Hero calls.

River: (15.25 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Super-LAG checks, Hero...?

Final Pot: 15.25 BB

Do I value bet?

He's very loose and would easily complete my raise with almost anything in the BB, so a 5 is not at all unlikely for him.