$11: 99, maniac all-in raise, ??

[bema03]

Reads: Villain is a maniac. On the very first hand, he called a pf raise with 56s, then went all-in against two opponents on a flop of 3-5-8. A 5 hit the turn and he tripled up.
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Big Blind is 80 (5 handed)

Hero (2580)
Button (1970)
SB (2710)
BB (1620)
UTG (1000)

Preflop: Hero is CO with 9[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img]
<font color="#666666">1 fold</font>, <font color="red">Hero raises to 200</font>, <font color="#666666">1 fold</font>, <font color="red">SB raises to 2710 all-in</font>, <font color="#666666">1 fold</font>, Hero??

I folded and ended up going heads-up with him and winning, but this hand had me wondering. I'm almost positive I was ahead pre-flop but wasn't sure if it was worth risking all my money when it was so close to the money.