checkraiseflop = 30% over 150 hands samplesize. I really dont know if we can really call here EV+?

[converted_hand][hand_history]Poker Stars, $0.25/$0.50 No Limit Hold'em Cash, 2 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite. View Hand #13653712

Hero (SB): $107.38 (214.8 bb)
BB: $64.36 (128.7 bb)

Preflop: Hero is SB with A J
Hero raises to $1.50, BB calls $1

Flop: ($3) 8 8 A (2 players)
BB checks, Hero bets $2, BB raises to $6, Hero calls $4

Turn: ($15) 5 (2 players)
BB bets $8.70, Hero calls $8.70

River: ($32.40) 4 (2 players)
BB bets $24.50, Hero calls ?

Snap call

worth thinking about is what kinda textures he CRs and with what range, and any showdowns you've seen, based on that and any other reads you should have a better idea of whether this is a call or a fold

He's got straight flush, jk.
It's not like you are playing sophisticated opponent at NL50, so his (2nd)3rd barrel will be skewed towards spew or value - you are the one at the table who has to figure out what he is up to, given that you've played him 150 hands already.
Is he doing it with ATo-A2s? Doubt it, but it's possible.
Is he recreational player or reg? How many hands he flats preflop, is he a NIT preflop or does he like to flat all kind of 8s, not only like 76s-96s/85s, but also like 87o+/86o+, K8s- etc? Is 76o in his range at all and what hands he 3bets and at what frequencies?
IMO without beeing in game and having other information i believe you are good enough over 1/3 of the time with your hand both against weak reg and random fish, slightly +EV in a vacuum.