FTR Hand History Converter Output (intended for copying and pasting into poker forums!):
Full Tilt No-Limit Hold'em, $0.50 BB (5 handed) Converter Tool from (Format: FlopTurnRiver)

BB ($31.45)
Hero ($55.05)
MP ($30.75)
Button ($55.50)
SB ($53.35)

Preflop: Hero is UTG with A, A.
Hero raises to $1.75, 1 fold, Button calls $1.75, 2 folds.

Flop: ($4.25) K, 6, J (2 players)
Hero bets $3.5, Button calls $3.50.

Turn: ($11.25) J (2 players)
Hero bets $7.25, Button calls $7.25.

River: ($25.75) 8 (2 players)
Hero bets $14.5, Button raises to $43 (All-In), Hero curses and ???

How many people think this is a good spot to check call the river as opposed to leading out?

I can get value from anyone betting their K and also get QT and any busted spade draws to bluff. If a J bets into me at least I'm not the one betting and getting raised so I lose a smaller pot.

Is that reasonable logic?

if by perfectly you meancalling a raise with J8 and going runner runner, then yes, he played it perfect;y.