This kind of LED has not been used in any other hosts until now, so it's kinda hard to say whether it's weak or not. The closest thing we have to compare to are Vinh of Skylumen's modded BLFGT and TN42 lights sporting the CFT90. The CFT90 is the same die size and nearly the same output, but it's a little older. That emitter is also 100 dollars per pop.
Those modded lights being driven to 5500 lumens can also only manage 1-2 minutes on turbo before heat becomes too much of an issue, and have to step down.
Running at 2500 lumens continuously with ruler flat regulation for 2 hours on just 4 18650s is phenomenal for a thrower emitter. Yes, you can get slightly better numbers with an XHP70.2, but it's also a much more larger die that has more efficacy. For reference, the BLF GT can run the XHP35 HI at 2-2500 lumens for around 2 hours with slightly tapered regulation, and it drains 8 18650s.
Think of this light as an alternative to the BLF GT, it trades some throw for flood when both are compared at their 2000-2500 lumen outputs. But, it has the ability to outthrow the GT and massively outflood it with a short turbo burst.
I have my critiques with why they would put heatfins halfway up the reflector, and not more towards the neck, but I think the performance of this light is very good. Seems like an efficient driver, and the SBT90 also seems to be very efficient when not driven to insane levels.