I already did. You may say why ? Because one of my rigs with modified bios and 6 x RX 570 series is doing 4950 h/s on Monero/Cryptonight algorithm. Paying 26.5 USD daily I guess one of the highest for such configuration and Monero is my favorite algorithm because it consumes less energy.
Same cards on Winminer were doing 3600 h/s or 17 USD daily, that is 270 USD more monthly with Nicehash. I would be stupid to not go back. I think they will not be hacked anymore and store all the coins in cold storage now.
The only thing I disagree is the same min payout, I would love to see 0.005 btc as min withdraw.