Personally I'm doing okay with Lending Club. I found about 125 notes in July that met my criteria and so far in August I'm still finding them, although it hasn't been easy. I do not use automated software, my notes are all hand picked. That said, I have to be VERY fast at purchasing notes at their issue times throughout the day. Most of the ones that fit my criteria go in seconds, minutes at most.
On the other hand, Prosper has become almost impossible to manage. I'm barely keeping up with reinvestment and have no chance of adding new funds until Prosper finds a way to bring more borrowers to the platform. It would seem that we've reached a point on both lending platforms where growth is being limited only by supply. But if Prosper could find enough borrowers, I believe it would grow to profitability very quickly, of course Lending Club is already there.
Finding borrowers may be the biggest challenge to growth going forward with P2P. We all know though that there are plenty of debtors out there, but the challenge will be bringing the qualified ones to these boards. It should be interesting to see how well Lending Club and Prosper does at addressing this.