If I could find a keyboard that was as robust and pleasant-typing as an old Model M, but was ten-key-less format (and I could afford it, preferably more than one), I'd be very happy.
I used to use an original model M, till it failed. Then a variety of membrane switch cheapies, but they feel horrible and don't last long. Then from trying a cheap tenkeyless (no numeric keypad) and realizing how much better the ergonomics are, I bought a Poseidon KB-PZX.
I love the small size, reduced distance from mouse to keys, and the mechanical keys typing feel.
Downsides:
* Over time a few switch contacts have gone intermittent, and had to be opened up for cleaning. Which isn't so hard, but is annoying.
* Cheaply made keytops. Keys are illuminated, meaning there's an inner translucent body and a black outer layer with the legends, so the legends glow. But the outer layer is thin, and is wearing off the most-used keys. Which makes the keyboard a short lifetime product, unless I can get replacement keytops.
* The illuminating LEDs under each key are above the key shaft. So keys that have two legends (eg the numerics along the top row) only get the upper symbol illuminated. To 'fix' this with the numerics, Poseidon made the stupid decision to swap the numbers and symbols, ie say 4 at top, and $ at bottom. Which means the shift function is actually reversed from what you see. This really messes with your typing reflexes. It's the worst problem with this keyboard. Solely for that reason I wouldn't buy another.
Edit to add: The current manufacturer's fad, seems to be keytops with absolutely flat, square tops, with little space between the keys. I find this astonishingly stupid. There's no tactile feedback for your finger placement accuracy at all. Add in the mushy feel of membrane key travel mechanics, and these keyboards are not fit for purpose imo. They are soooo bad they set my paranoia off, making me suspect they are deliberately intended to cripple the ability to type rapidly. (Yes, I know, probably just stupid designers. Probably... But it's really an unbelievable level of stupid.)
Oh, and another problem with the KB-PZX, is it seems to have a relatively slow scan speed, scanning the matrix from left to right. Or maybe I'm developing a different latency between my two hands, it's hard to tell. Anyway, result is that if I'm typing fast, and I meant to type a letter with my right hand then one with my left, they'll appear reversed. For eg just then when I typed "hard" it came out as "ahrd".