I rented his rig yesterday for 12 hours. Got a lot of rejected and stale shares, never had this problem before using the pool I used. Hashrate was stable however and there was no downtime.

I also messaged him when I was getting those rejected or stale shares but he never replied and my rental period expired hours ago.

Overall this went OK. But honestly I don't feel that it was profitable enough to consider renting a rig again. I definitely paid much more in btc than I made in ltc.