I think they are brilliant! I’ve sealed hardwood in the hall and lounge and tiles in the bathrooms, kitchen, utility room and conservatory.
There is a lot of choice and a wide price range. I’ve had 3 mops in about 10 years - started with one just under £100, then £70, but my current one is a basic model and was only £40. They just give up the ghost and aren’t repairable!
On the plus side, they clean and sanitise using plain water and leave floors almost dry, but you’ll still need to wipe the corners/edges with a bit of kitchen roll. Most have a detachable unit to turn them into a hand held for fiddly tasks too and the best one had a variety of extras for cleaning windows, stainless steel, grouting etc.
If you can get the shopping channels on tv - try and watch some infomercials, or google online, and if you get one through QVC and don’t like it for any reason, you can send it back, even if you’ve used it.