I have been investing now for 11 months, I started with 1 or 2 notes per loan, now I invest 6 per loan. Reason being that it becomes quite a lot of work re-investing paid off loans and if one stuck to 1s and 2s you would have a lot of loans and after a few months it would require constant attention to keep all your money "active". I have invested in 181 loans and 43 of them have been paid back in full, the return from these is not that good but still satisfactory. Harmoney advised me some months ago that the expected early payment of loans was 28%. Looks like that figure could be a bit light.
My strategy has been to concentrate on 36 month loans (95%) not too many A's or F's. Probably C and D loans weighted. Borrower's monthly payments must not exceed 10% of income. So far I have had no write offs, although there are a couple of arrears that are 2 months old. Going back to the first 2 months, I calculated a gross return of plus 16% on those loans, so if this continues one can stand a write off or two.
Over all, happy with them now that most off the bugs seem to be sorted on the website.