I have multiple ones and they work fine. That said, I'm not running anything heavy-duty, like e.g. a gaming-rig, off of them, so I don't think that's particularly useful here.
It'll say it's line-interactive or has an AVR in the specs. If it's an online-UPS, it's a more advanced version of line-active, but I doubt you'll find any online-ones in your price-range. (And no, online doesn't mean Internet-connection in this context) If there's no mention of it being line-interactive or online, then it's neither.
Personally, I'd recommend getting a line-interactive one, even if it meant saving up for it.