Been using Single Bet Calculator for about four months now, mostly late at night on the sofa, so this is just my two pence. Found it through a Reddit thread, wasn't an ad.
The lobby is genuinely huge — roughly 4,000 titles last time I counted. NetEnt takes up most of the space, so Sweet Bonanza and the rest of the greatest hits are present and correct. I mostly stick to Big Time Gaming megaways because the volatility suits me. The one thing that irks me — the search function on Single Bet Calculator is a bit rubbish, filters half work.
Live tables are powered by Evolution, which is fine by me. Actual dealers, decent stream quality, and the game shows like Crazy Time pulls a big crowd most evenings. Should mention the UK side is well covered in the evenings. Before you deposit anything I'd have a nose over on single betting calculator instead of trusting a random forum post.
Bonus-wise at Single Bet Calculator was ?100 matched plus 100 spins on Book of Dead. Rollover is 40x which is about par these days. I also got a small no deposit thing on verification. Min deposit is ?10, registration was quick, ID check was same-day.
Cashouts have been the best part. Visa and Mastercard take 2-3 days, Skrill and Neteller hit in a few hours, and Bitcoin is quickest if you use it. Pulled ?180 out on Tuesday no silly document requests. Support at Single Bet Calculator took ten minutes once, three another time — copy-paste at first but fine after. Licence is UKGC, so at least there's a complaints route. There's no app on the Play Store, just the mobile site.