Re: are these mechanical keyboards any good for actual work?
It's very subjective of course, but I like the feel of mine (IBM Model M "borrowed" from a server which ended up in a rack :-) more than any other keyboard I've tried in the last 30 years or so. It is too loud for a crowded office but is getting a lot more use now than it has in the last few years!
It's like using really good hand tools instead of cheap and cheerful - they both get the job done (usually) but one feels better than the other, and that makes the whole experience more enjoyable. I think it's well worth paying a premium for something that improves your life for eight hours a day or more.