Another fan of Streamlight here. I have a half-dozen of their weapon lights, and a handful of their flashlights of varying sizes. Other than a minor problem with a TLR-3 which may have been caused by an out-of-spec rail it was mounted to, I've been very impressed by their durability and output vs cost. I'm no operator, but my guns and lights do get banged around a bit in normal use, and they have handled it with no problems.
You can pay more, but you won't necessarily get more when all things are considered. You can pay less, and take your chances with long-term durability. Streamlight weaponlights, especially the TLR-1/TRL-2, are a proven quantity, squarely in the middle of the sweet spot of cost vs performance.
(I have no relationship with the company, other than being a satisfied customer)
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