I'm one of the ones that has used It for a while. It's alright, bubbles easily as mentioned, so want to mix carefully, but can thin them out of the mix before applying to the cue by setting It under the heat from a hot lamp.
Curing- want to make sure You still mix well while trying to keep those bubbles to a minimum, and try to get the mix ratio as close as possible for best results.
filling- It's alright, but don't expect one thick cote to get it with every cue, thinner cotes, squeezed in with a playing card will save a lot of unnecessary sanding.
Clarity- I haven't had any severe yellowing issues, so in that sense It's clear, otherwise Ivory in the cue is still white, but It can tint or darken some maple a bit if left too long before applying clear over It, although I wouldn't say It's a bad look like yellowing. This happens with age, but the top cote of finish helps lock It in. If you were to let It hang for say a year or so before finishing though, It may change some, and if You were matching a shaft after that period of time that wasn't sealed at the same time, then It could cause a matching issue, and say you accidentally knocked some epoxy off the butt below the joint during any punch out work or matching a shaft, going through the epoxy in the process, then it may look whiter in that spot then the rest of the forearm, so might as well sand it all down before finish, so You don't end up with a blotchy forearm that sealed in By the finish.
Another thing too, I suspect this may occur with other epoxies also, but just like with sanding, be sure to spot seal anything that Your concerned about getting bled on before applying It to the cue, especially with some rosewoods or the sort that are known for bleeding.
The end result is It works, and looks good once You get the hang of using It, learning all the little tics associated with the stuff, but how It compares to west, I don't know.
The finish Cure is quite a bit cheaper, but I have never used It. I do have a kit here that I am gonna try out though to see if I like It any better.