I've wondered about Alps.
I am on a constant quest to find something as close to buckling spring keys as possible; so far, I've failed. No matter how much I max out tactile or clicky, there's simply no substitute. I could just get a Unicomp, but they don't make ergonomic, column staggered keyboards, and my hand health is more important to me than even the peerless tactile experience of buckling spring.
I've heard that Alps are about the closest you can get; I've never encountered a keyboard with Alps keys to test, though. Have you used both? How do you think they compare?
I'm using Choc Browns right now; I got sucked into the whole low profile aesthetic. While I like the layout of my Piantor Pro and would keep that, I'd give up the low profile for anything closer to buckling springs.