My bike is a Halfords Carerra which I got 10 years ago when I retired. It now has those Frankenstien handlebars I put on for a better riding position, which got a laugh here, and work well. I have foam grips which, too are good considering my fourth finger is triggered. and doesn't like to bend too much. I also have a Gym seat cover which I use now on my road bike. I would highly recommend this cheap addition; it makes so much difference.
Tires are standard 700 by 25; 23 is probably more usual. It would take larger but not too much
I have ashopper with knobbly mountain bike wheels. Even when soft, you still feel thiose bumps uncomfortably; in that respect there's little difference.
Reviews, the few there are, are very positive. I shall think about it!