About two weeks ago I moved to a logitech slim k950. It's not mechanical but I love it.
Pros:
1. Up to 3 devices, instant switching, lots of nice touches too like additional keys.
2. Dont' need to use the logitech software at all - my work won't install it on my laptop but it's fine without it.
3. Battery life seems really, really good, estimate I'll get 2 months at least on the AAA batteries that came with it.
4. AAA batteries, not built in - I prefer not being reliant on built in batteries.
5. Decent bluetooth range or use the bolt wireless adaptor (I use bolt on my PC, bluetooth on my ipad and work laptop)
6. Near silent typing, no more complaining from the wife when I'm working early mornings.
7. Can work with logitech flow if you are into that. I'm not.
Cons:
1. No backlighting, although I got the off white variant and simply don't need it.
2. No cable connectivity at all.
3. Initially thought they hadn't included a bolt wireless dongle, but it was in a wierd spot on the box.
4. Not mechanical, snappy keypress but it's not the same. Feels more like responsive dome keys.
5. Limited adjustment, it's good for me but wife says it's a little shallow for her, she'd prefer the keyboard to be at a steeper angle.
6. Some buttons are slightly offset on the top row which can be annoying until you get use to it. F3 id partially above 4, this is because they've added a few media buttons etc to that row.