I've been using this for almost 10 years and I still have a love/hate relationship with it.
It does dry super fast, and it's the best quick-dry topcoat I've ever used, all things considered. It's nice and glossy, gives my nails a smooth look, and it does keep my polish from chipping just a little longer than other topcoats I've tried. So, it's kind of my HG topcoat, because it's generally reliable, but things about it annoy me.
It has the same issue a lot of other quick-dry topcoats have: it gets super thick and goopy pretty fast after you open a new bottle. I've had my current bottle since maybe spring of this year (so 6 months at most, probably more like 4), it's almost half empty, and it's almost completely unusable. They do make drops to thin it, but I've never found any (from the Seche brand or any other) anywhere near me, and I can never remember to order some. I'm also cheap, though, so I do the same thing I've done with thick polishes since middle school: I add a couple drops of pure acetone and shake it up.That's not the best idea, for a number of reasons, but it does work.
Maybe this is just my issue, but I also find that cleaning up mistakes is so much harder when I use this topcoat. That really sucks because I don't have the steadiest hands, so I always end up with polish on my skin around my nails. (The other quick-dry topcoat I use when I can't find Seche Vite, also makes it slightly more difficult, but nowhere near as bad as Seche. Like, on a scale of 1-10 with 1 being super easy and 10 being impossible, other topcoats are maybe a 4 and Seche is an 8.)
Honestly, I like this best on my toes. My toenail polish always lasts waaaay longer than my fingernails anyway before it starts to chip, and this stuff can keep my polish locked on for a month without chips (as I found out last year when I had surgery and couldn't pain my toes for like 6 weeks haha.) I've also found my toenails look shinier longer than my fingernails. I just painted my fingernails less than 24 hours ago, and the shine is already significantly dulled (and I haven't really done much since painting them). It looks no different from any other topcoat. But for the first twelve to twenty-four hours after painting, this stuff is way shinier than other topcoats I've used. My toes, however, were still quite shiny last time I removed my polish, and it had been over a week since I painted them.
-Not too expensive anymore (it's actually cheaper than Essie and OPI at my local Walmart)
-Usually easy to find in stores
-Dries super fast
-Very shiny initially
-Gives nails a smooth and even look
-Helps prevent chipping for a couple of days (usually)
-Goes thick pretty quickly
-Loses shine after about 1-2 days
-When it does go thick, it will most likely ruin your manicure
-Makes cleaning up the edges much more difficult (maybe this is just me)
-Doesn't really extend my manicure more than maybe a day longer than any other topcoat