I would say that the sound might be a tad bit lighter with these caps as opposed to the nice PBT of the AEK2 caps.
As you would expect, these feel just about the same as any SP DCS keyset, so nothing crazy.
The AEK2 caps are a pretty thick PBT and really do feel nice to type on, but they have that quirk of the "nibs" on the home row being on the D and K keys instead of F and J. Which even if I
swapped positions on the keys so it felt right when touch typing, I would (frequently enough to piss me off) screw up passwords when looking at the keyboard when typing them in.
That quirk aside (which is pretty nit picky) I think the AEK2 caps are by far the best feeling and sounding I have tried. They have a good texture, and produce a nice thock - even on such an open case/board as this one.
I still have parts for another full Alps 60% that I need to put together, as well as a set of SGI Granite keycaps (if I can find them) and a set of Tai-Hao Alps keys to try. Maybe I will put together a nice roundup/comparison of Alps keycaps sometime in the future.