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They're bit slower in general, but they're consistent. We have enough volatility and randomness in this market as it is!

I find myself using bittrex more, even though i prefer poloneix's interface. I think the fact Bittrex have more coins is a big deal :P
Kraken on the other hand.... I've been waiting for tier 2 approval for over a week now :(
These companies have got the $$ but they sure aint got the staff.