I've bought holographic #62 and #49 Flakies.
#62 is the most troublesome nail polish I have ever had. I read that it should be applied with Aqua base from Nfu oh, but I though it wouldn't be such a problem, so I didn't order it.
I tried my standard Essie base coat I always use, but it was a nightmare.The coverage was uneven and with colorless spots. So I tried to use it without base coat at all. It worked out, but the shine in the day light was not intense.
Overall it is the brightest Holo I've had...SH Prism or CG are far far behind.
I will order Aqua base and compare the effect and coverage.
#49 - is a pink-orange flakie with hint of green under certain light. it's totally amazing, but a lot depends on the base color . I used Essie Angora Cardi as a base. Overall, it gives a thick coverage and dries slowly...but the result definitely worth it:)