10 NL - FH BvsB against unknown

[ZingZhang]

Villains 1st orbit at the table, the only thing I know about them is that it is their 3rd hand, having posted UTG and that they bought in full. Given the UTg posting..e.g. donk, and absent of any other reads, is this in anyway reasonable or am I burning money?
I know, flop bet size prob sucks, but it was very much a feeler bet as it's kinda unusual for BvsB to happen at 10Nl w/o some history imo.
Anyone like a turn raise or does that commit us to the hand completely and in a way that makes us over value what we have?
River was an insta pot, if that makes a difference

Cheers guys [img]/images/graemlins/smile.gif[/img]


Full Tilt Poker, $0.05/$0.10 NL Hold'em Cash Game, 5 Players
LeggoPoker Hand History Converter

BTN: $2.50
SB: $10.15
Hero (BB): $10.50
UTG: $9.05
CO: $12.40

Pre-Flop: 7 8 dealt to Hero (BB)
3 folds, <font color="red">SB raises to $0.30</font>, Hero calls $0.20

Flop: ($0.60) 8 5 5 (2 Players)
SB checks, <font color="red">Hero bets $0.30</font>, <font color="red">SB raises to $0.60</font>, Hero calls $0.30

Turn: ($1.80) 5[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">SB bets $0.80</font>, Hero calls $0.80

River: ($3.40) Q (2 Players)
<font color="red">SB bets $3.40</font>, Hero ...?