I've been lurking around, reading others thoughts on keyboards and listening to recordings - all very "helpful" information, if you believe that sending my mind in circles and bring me to the verge of insanity "helpful"!
Back in the day, my K-12 had true blue blooded IBMs in the labs, so I had a good 6 years of typing on Model M boards, not to mention learning touch typing on those. Today, I just wanted something with a better feel, but something a bit quieter than the M. I'm not sure that the ABS M1 fits the latter, but we'll see.
Currently, our main machine has one of the original MS Natural keyboards on it - something my parents bought me as a graduation gift in 1995. After 14 years, it has held up extremely well, save for some yellowing. It's an OK keyboard, with reasonable tactile feel. It developed some sticky and stiff keys 10 years ago, but that was quickly remedied with a bit of graphite from a pencil - my old trick for a readily available, reasonable and nearly permanent lube. It hasn't been apart since.
I've had no real complaints, and we would probably be happy with something like the Dell RT7D50 that I'm typing on right now (at work.) It feels a little stiff, but it's much better than the newer model Dell I had. We don't do a lot of typing at home, but if we're going to go back to a non-ergo board, I wanted something with better keys - not necessarily the best, just better.
FWIW, I've otherwise had mostly Keytronic boards, from lowly OEM boards that were OK to a higher end KB101 Plus that I still have sitting in the basement.
We don't type that much, and we're both right around 80-90 WPM, so I'm hoping the ABS M1 will be a good fit performance wise, even with its issues. The main concern is the noise, which I suspect won't bother me but may bother my wife.
I'll give the M1 a couple weeks, at which point I may give a Felco a try, or otherwise start rummaging around the local PC recycler. I work in IT, and we unfortunately have not had any mechanical boards in the 9 years that I've been here. All that is left is a few IBM terminal BS keyboards.