From a “safety”(?) standpoint, there’s near-zero risk doing a review on Amazon. They screw you on the rebate, you return the item, get back your bux, and can then be free to trash the product as much as you want even out of spite. So it’d be stoopit of them to not give you that rebate or whatever.
Best, though, is to make sure that it’s something that you’d want to keep for yourself (or at least give as a gift). If it’s something you don’t want, and would likely just throw it out, you’re not doing anyone any favors by reviewing it. I got a few queries about reviewing items I had no interest in, and politely declined.
More important, though, is to try to ascertain if it’s good enough for you to be honest in your review. If it’s a “10000lm zoom AA tactical light” that looks like a mutant SK68, there’s no way you can give an honest review, let alone 5 stars. 100lm, maybe if you’re lucky, but… How can you not trash it in a review?
So assuming it looks nice, fits the description, seems honestly advertised, and is something you think you could honestly review, why not? (Repetitive word in there is “honestly”, so if there’s anything that seems deceitful, just pass, and don’t wrestle with your conscience. It ain’t worth the grief.)
One thing I’ve done in the past is to stress, “Okay, but I’ll do an honest review, is that okay?”. If you get the “No, we want 5-star!” demand, just pass. Say thanks-but-no-thanks, and don’t respond any more. Those are typically the 10000lm zoomie products, garbage, so don’t even bother.
Curious which is “brand S” everyone’s going on about, though. Ofirn? Unwayman? Treamlight? I feel so left out…