I use stats.hashco.ws to gather my stats for hashcows so if they're incorrect so am PoolPickers.

FYI. For 48hrs mining on hashcows with ~1.1MHs has gotten me 0.0047 BTC (unex, exchanged and paidout.). Not exactly matching what they claim....

after 12 hours of mining on hashcows with 2.6MHs my balance was 0.00237467

I threw between 1,5 and 4MH/s to HashCows for 24h, maybe even longer.. Then i saw i only made 0,00097! Yes, a zero extra.. Was expecting at least 0.010 per MH/s, based on their stats.
Maybe an error on their part, but i decided to split 2MH/s to Clever and 2MH/s to Waffle for now..