I've been using this
Unicomp Ultra Classic for almost a month now.
It took about a week for me to get used to the loud tappa tappa tappa and the extra force necessary to press the bucking spring keys, but since then I've been in love with it. The build quality is definitely a bit cheap; the base creaks when pressed upon and some of the key caps had little plastic pieces still attached, which is disappointing considering it cost $80 (
this video review covers the build quality problems pretty thoroughly). But again, since the first week those flaws haven't bothered me and I've been loving typing on it. I was worried that the noise would become annoying when playing games but in Battlefield 3 it's not annoying at all, and in fact it feels like what I should have been using all along. Being able to both feel and hear when a key is pressed is immensely satisfying. I chose this over a Leopold Brown and while I'm very happy with my decision I'm still curious about the Leopold. I might order one someday when I have money to burn, but I'm afraid that after continued usage of the Unicomp I won't be happy with anything other than buckling springs.
Anyway, this is a great thread, and I'm glad it's helped spread some ASMR awareness (I didn't learn of its name until a few months ago
on reddit)!