So as a disclaimer, I tend to not use this topcoat as the "first" topcoat, but rather as my refresher topcoat and so am reviewing it on that basis only. I usually use something like Seche Vite or SH Insta-Dri on my initial polish application, and if I do want a manicure to last and look good for more than 2-3 days (not often, as usually I am ready for a change by then!) I re-apply a topcoat every second day or so...and this is where the Extra Life Topcoat comes in.
I have found using a quick dry topcoat over already long dried polishes/topcoats leads to unfavourable results - like cracking - so I use "regular dry" coats. I've experimented with a few different ones, like Essie's polish refresher which I like, but I find the Extra Life Topcoat one to be an excellent option for a more reasonable price. I don't know how much it gives "Extra Life" as I tend to never WANT to wear the same mani for more than a few days, even if it still looks great, as I get bored and have so many polishes I want to play with, but it does add fantastic high gloss shine that makes my manicure look brand new all over again, the formula is easy to apply, and it just works well as a "refresher" as the formula allows me to do fairly thin layers unlike some other topcoats. Though not quick dry, it does seem to dry relatively quickly, in 10-15 minutes, and best of all has never caused any issues with the existing layers like quick dry topcoats often do for me. I have often applied this one 10-15 minutes before I need to leave for work in the morning, and it has been just fine despite not being gentle with my hands on my commute.
I also will use this topcoat when I add a topper to 1-2 day old manicure (when I am already bored with the colour and need some glitter :)). I'll put the topper on, let it dry well, and add the Extra Life Top Coat to smooth things out a bit and add (lots of) shine. It is perfect for that as well!
I don't think I would ever use it as my primary first topcoat over the base colour, as I am impatient and, well, I am pretty partial to my Seche Vite and kin, but for what I described above? It is pretty much perfect for the price.