Well tbh its up to you to do your own due diligence.
From my perspective, pirateat40 had no investment model, hew would not explain what he was doing with the funds and offered no insight into where the profit came from.
Pyramining has a credible model and the figures stack up. I have full confidence in this enterprise. The only thing that could impact on it, is when ASIC hits the market and he has already expalined how he will address this.
Having said that, you should never invest all your eggs in one basket, so I would not sugguest that you pile all your funds into Pyramining.
I for one belive this is a decent, enduring (as long as mining is profiatable) enterprise that is well worth investing in.
But thats just me. You will need to make your own mind up!
seems like a pretty nice investment, instead of hoarding my coins, i throw 50% of what i mine every week in there and watch it grow slowly, 10btc so far