Great uptime, payouts are quick and never have had issues. Would recommend.
People that say Nanopool doesn't pay out as much as others don't understand pool difficulty. Have been mining with them for years and have never had a problem.
Mined a bit of ethereum on nanopool in 2017, the payout was very low compared to other pools I tried out at the same time - with the same hardware (Nvidia GTX1060).