I probably would buy this again in a pinch, but it's not a holy grail or anything.
The shade range is more balanced than a lot of brands (and I love that they included different undertones), but I feel like it could definitely use some more shades, particularly on the deeper end of the spectrum. That said, I really appreciate that for the first time in my life I was able to find a concealer that was fair enough for me to be able to make it work (I got Fair Beige because I have neutral undertones, and it's pretty much exactly the same color as my skin when I first apply it). It does darken a bit after it dries, though, so I think they could use at least a couple lighter shades, too.
My biggest complaint about this concealer is that it's very dry after it sets, and it sets fairly quickly so I usually do one eye at a time. It's not too bad under my eyes, or on my eyelids, as long as I have plenty of eye cream on and only use a tiny bit of concealer, but if I use a little too much of either, this can look really cakey. I've used it on zits, and I don't really recommend it unless the spot is totally smooth. If there's any dryness, or if it's a spot that has fully come to the surface, this doesn't cover very well and it will cling to dry patches like crazy.
I have dry skin, so maybe this would work better for someone with oily skin. I recommend making sure you seriously moisturize before using this, and maybe even thin it out a little with moisturizer or a hydrating serum. I've made it work pretty well for me by doing that, but I'm also fine with slightly lower coverage. I don't use a ton of concealer under my eyes, just a dot near my inner corner blended out to cover the darkness.
I haven't had too many issues with it creasing horribly, but it doesn't look amazing under my eyes because it looks dry. I don't really have generally noticeable lines (yet), but I do still have to tap this out with my finger a little when I finish blending with a brush or sponge, to smooth it out a bit more. Sometimes it still creases a little throughout the day, but it mostly stays put. I haven't put it through a 16 hour wear test, but it did hold up for 12 under my eyes. For acne spots, it varies. Under ideal conditions (no dryness, etc.), and if I lightly set it with powder, it holds up for at least 6 or 8 hours, but it does start to look a little cakey around that point.
I go back and forth about setting my under eyes, but I think overall this one does look better if I do add a tiny (and I mean TINY) pat of powder. Too much, and it looks even dryer, but if I use a very light hand, I think the powder helps smooth it out.
So, if I really wanted a full coverage concealer, I would buy this again. But, there are a lot of concealers out there that I haven't tried, so I doubt I'll repurchase this one anytime soon.