If you’re going to buy knockoff FOSCAMs, you can get them even cheaper on ebay:
I’ve used these type of cams a lot for low cost security system solutions (usually with ZoneMinder security software), so here’s my experience:
The picture quality isn’t great, but if you’re using them more as a monitoring solution then that doesn’t matter much really; you mostly just want to be able to detect motion and have “good enough” footage to identify someone on cam.
The frames per minute is low.
The firmware has an unfortunately tendency to reset itself to factory defaults, screwing up your system at random. I keep a backup of the settings handy to reupload whenever that happens.
The control software is pretty poor unless you already know what you’re doing - don’t expect a user friendly product.
All that being said, if all you’re looking for is semi-disposable cams for a home or business non-mission-critical monitoring network, these are a decent budget choice.