I have used full-size Model M keyboards for many years, but recently, for various reasons, I decided to switch to a smaller keyboard, such as a tenkeyless (TKL). Initially, I could not find the IBM version of a TKL board, the IBM SSK, and so I started acquiring contemporary boards with Cherry switches.
At first, the transition to Cherry-switch boards from a Model M was a kind of culture shock. The Cherry boards, even highly regarded ones such as the Filco Majestouch2 TKL, felt like cheap toys. I wanted a keyboard for grownups! Nevertheless, as I became more accustomed to modern keyboards, I started enjoying emptying my wallet on custom keycaps and decorating my keyboards to my liking.
My most recent acquisition among contemporary boards was a CoolerMaster QuickFire Stealth with Cherry mx green switches, which are similar to blues but with a stronger spring. Although typing on a Cherry-equipped board is nothing like typing on an IBM Model M, I appreciated the relatively hefty resistance provided by the green switches.
During my quest, I was fortunate to find a new-in-box (NIB) IBM Model M SSK on eBay, and I have returned to this as my main keyboard ("daily driver") for serious work. Not only do I prefer the look and feel of the IBM over other keyboards, I find that my typing speed and accuracy are far better on IBMs than on any other boards I have tried. Despite returning to the buckling spring, I have also developed a fondness for new keyboards with Cherry switches, and I rotate through them now and again to provide some variety. I am also interested in customizing them, and so I have been acquiring vintage Cherry, Wyse, and Dolch keyboards to harvest double-shot ABS keycaps. In addition, I keep an eye open for dye-sublimated PBT keycaps, because I prefer their durability and dry feel to the sometimes sticky or clammy feel of ABS plastic. BTW, the IBM Model M and SSK come with dye-sublimated PBT keycaps.
Although I am probably all set with the IBM buckling spring keyboards, I still intend to try some boards with Alps switches and Topre switches. From what I have read, I do not anticipate liking these better than IBM buckling spring keyboards, but having come this far, my journey would not be complete without trying out these other major switch types. I am also intrigued by sub-TKL mechanical boards, ranging from 60% to 75% of full size.
Finally, some people find that Unicomp buckling spring keyboards work well for them. However, they did not work for me. I think if I were unable to find IBM Model M or IBM SSK keyboards in good to excellent condition, I would prefer to use a quality keyboard with Cherry switches, preferably mx greens, although this particular variety of Cherry switch is currently in short supply and available on only a few keyboards.