What winning % should I expect at heads-up SNG??

[PrayingMantis]

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The big downside is that specialising in Head's Up tournaments is going to help your overall poker game even less than regular SNGs.

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This is definitely not true IMO. I think that HU, especially if you go a bit higher than the really low buy-ins, can seriously improve your overall NL skills, more than normal SNGs for that matter. Reasons: much more post-flop play (this is an understatement), much more read-dependent play - as with tactical decisions regarding specific hands, and strategical ones regarding specific opponents.