OK, here's my review:
Linears:
My only experience with linear switches has been with vintage blacks, so when I tried out the stock red and black, they felt gross and scratchy. I think I'm spoiled now and would have to use lubed or vintage switches if I were to use linears. It's hard to tell with this switch tester, but I much prefer stock reds to any other weighting. Since it's kind of annoying to try to float without tactility, it's best to have a fairly light spring since you're bottoming out on every stroke—that's why the reds are my favorite. 62g is OK, but it's actually slightly too heavy for me. 55g feels great. I might try getting some 55g springs and tearing the vintage blacks out of an old cherry board to get the perfect linear switch
Oh—and ghost reds! They're OK. A bit too heavy for me. I don't think I'd use them unless I were trying to float on linears. I bet they'd be good for gaming, actually, since it's easy to sit around the actuation point.
I also forgot linear greys. The only thing these switches seem good for is spacebars. They're ridiculous for an entire board, unless you're the hulk.
Tactile:
I've typed on stock clears and 62g clears before. While I enjoy both, the stock clears are a bit too heavy for me, so I prefer the 62gs. On this tester, the browns were completely new to me. I've heard a lot of bad things about browns, but they don't actually feel that bad. I can see why they feel like a red with a grain of sand stuck in them when you press the key extremely slowly, but at normal speed, they feel like reds with a hair of tactility. I think they'd be very nice and light, and would prevent some of the false actuations you can get with reds.
The clears were...odd. I'm not sure if they're vintage clear stems, but they felt much different than my new (but worn down) clears on my filco. They just felt less tactile and scratchier than any clears I've used, and the 62g one was very sticky. I think they're either vintage or very worn down, because mine stick with any springs less than 62g and no lube, and these didn't stick at all, even with 45g springs. I'd have to say, if you haven't tried clears before, I don't think that this tester gives a good impression of stock clears new from the cherry factory. Perhaps it gives a good impression of vintage clears. It's hard to say since I've only tried new ones.
Also, tactile greys feel like heavier clears. No me gustan.
Clicky:
My first mechanical keyboard was a daskeyboard with mx blues. Since I've tried other switches, clicky switches have become very "meh" for me. I hate the sound, and I dislike that the tactility decreases with lower weighted springs. The greens and 80g blues are also just too heavy for me.
The only clicky switches that I liked were the whites and the jailhouse blues. Some people might criticize me by saying that I only like the rarer switches because they're rare, but I legitimately prefer whites because of their softer click, and I could see myself using 55g or 62g whites in the future.
The jailhouse blue was very cool. Since the actuation point is right at the top, and the force required after the bump gets up to a similar level as at the actuation point, it seems like it would be quite easy to float with these. They also feel more tactile than other comparably weighted clicky switches.