[gorkonsine]

Well these days, with Amazon, that's what the reviews are for. I've passed on lots of purchases because I looked at the reviews and saw too many negative ones, and bought other things after seeing almost all glowing reviews. A bad-quality product can lead to poor reviews, and this can affect sales.

Manufacturers' warranties are only so useful; a lot of companies make you jump through hoops to actually make use of them. If the product isn't that expensive, you'll end up paying so much in shipping that it just isn't worth bothering with when you can go buy a new one. And you always take the chance that they'll simply deny your claim and then your recourse is to sue them (not worth it for anything under a few thousand dollars) and to post bad reviews.

[kqr]

I'd like to point out an addition to this. Always read the negative reviews. Don't just count them. I put much more weight on the negative reviews than the positive ones. You can frequently tell if the bad experience is due to a user error or if it's a systematic fault in the product.

If a product has 70% negative reviews, of which 90% are operator error, I'll probably still prefer that product to the one with only 30% negative reviews where only 30% are operator error.

[gorkonsine]

That's a good point. A lot of bad reviews are clearly user stupidity: I even see ones where they obviously bought the wrong thing, had unrealistic expectations, etc., and then gave a poor review based on this. Or reviews where the merchant (usually Amazon) screwed up somehow, so they give a poor review to the product.

On the other hand, positive reviews are frequently either lies or fluff, so you're exactly right to weight them much less. A lot of them look like they're written by shills, some of them even clearly say they got the product for free or cheap in exchange for a review, and many are written shortly after acquiring the product so they really haven't had enough time to fairly test it and see if it's reliable long-term.

Also, well-written negative reviews will go into great detail explaining exactly why the product is crap, so look for those. I'm remembering a great (and long) review I read for an automatic cat litterbox which attaches to a toilet here, and sometimes ends up cooking cat turds...