I would say the 12 XM-L I modded here is way better.
The head of the light in this GB is only 74mm according to GearBest. That is the same as a typical 9 XM-L light, if not smaller. Since its using 12 emitters, you will get smaller reflectors, and less throw. With a 12 emitter light you already have enough floo IMO. I also think the reflector design is bad, and not optimized.
The 12 XM-L light I linked to uses 6 18650 cells instead. Offers better runtime and potentially more oomph at lower weight per mAh.
Ofcourse, its preference when it comes to formfactor and such. The 12 XM-L stubby will also have more amps running through it since its only 2 cells in series, and that can be a con.
Personally, if I wanted a toilet plunger with a head size of less than 80mm, id rather have a 9 emitter light. Easier to make a more usable beam, and still enough emitters to make it overheat in no time if you make it into a hotrod.
Not a fan of the design of this light either. Looks like they took the battery tube from a completely different light. Just looks wrong to me.
If people are going not going to mod it, and get the "good powerful driver", then this is probably great value.
If they are going to mod it in order to get rid of blinky modes, or fix the annoying next mode memory, then they might as well look for the better host. A 9 XM-L light can usually often be bought for as low as 50$. With a GB, probably lower. A zener modded fet driver can be built for around 7$, and max output does not need to be 100% if that is too much. That could give you similar performance, but with better throw and lower price for a modded light.
Just my opinion...