Ya i find they grow and color up just fine. I actually have 4 xr30w that i got used for a giveaway price. I use 2 of them on one of my tanks but almost everything else are knockoff stuff(orphek led bar knockoffs, noopsyches, kessil a360 knockoffs, some 50w "spotlight" lights i am trying). Also have one legit kessil a360 i won at a raffle. I find they all grow coral and can color up coral with no issue whatsoever. My xr30 are probably least favorite of the bunch and have ordered a couple promising looking lights from china i may be replacing them with.
The biggest issue in any of the knockoffs or discount brands for me is usually controllability. Usually the apps are less user friendly. In something like the vipar there is no ability to ramp up/ramp down/etc which is the reason i wont buy more of them. Other knockoffs do have this ability though. Below is some of my coral under my vipar as example.