I've been investing for over a year and have been able to regain my entire principal from my investments. I am currently investing only with reinvested interests.

My general approach is to avoid borrowers that attempt to borrow more than they have been able to pay back in previous loans. I do make exceptions for small loans (< 2 BTC) with high return potential where I typically invest close-to-dust amounts.

Overall I'm happy with my BTCJam experience. The only aspect I'm sad about is that the number of available listings seems to have dropped significantly over the last 12 months. I wonder if management can maybe do more to advertise their service. As of now, good loans get gobbled up in a matter of hours as there is a surplus of lenders relative to borrowers.

Happy Investing!