Sorry to post to Ye Olde Thread, but a NIB Dell KB-1421 came in at the community recycling depot where I volunteer... I really like it!
You have a BTC, right? How do they hold up to that? :)
Yes, I have barely-out-of-the-box examples of both within arm's reach.
Dell: Quiet, smooth, fast. Modern-looking (compact, flat key profile, black).
BTC: Much stiffer. Noisy, but in what most of us would consider a good way. More cylindrical buttons. Big-ass Enter (but both have normal Backspace). Retro-looking (1" bigger in every direction, curved profile, pearl).
Basically, we're talking vintage vs. contemporary. People into older boards would prefer the BTC. People who just want to type would go for the Dell.
Surprisingly, they weigh about the same. As far as I can tell, this is because—despite its small size—the Dell has a thicker case. They're both solid, well-made boards with no flex. The BTC's keys rattle a bit when shaken sideways, but that's probably because they're sliders over domes, which are bound to be more complicated.
I'm amazed something as solid and handy as a NIB Dell KB-1421 can be had for around $15 shipped. (
Here are the ones currently on eBay. As I write, there are two at $17.99 or Make Offer, free shipping.) It's loads better than the flimsy membrane boards they sell in big-box electronics stores. If you just want a compact, reliable board to take places where you might worry about an MK, it seems perfect.