I've had a S7 for a touch over a month. I figured out pretty quick that Nicehash is EASY and you get a reasonably steady stream of income (Well until today, Oops Nicehash), but you pay for that convenience.

On Slushpool sometimes you get good days, sometimes great days (mid Nov ~20btc blocks!!!) and sometimes slow days. Luck of the pool.

The interface is pretty nice and the mobile app is good too. I much prefer it to suprnova and a few others, that I've used with my 4x GTX960's on various altcoins!

Got another S7 hashing on two cards to add when my PSU turns up and an S9 when bitmain get around to shipping it to me 

(Wooo. First post after SOOOO much lurking)