Anyone ever bought these? Any good?

[Pareeeee]

Do they work? Are they any good?

Has anyone ordered these from China? I mean, half the supplies we buy here in North America are shipped from there...so I'm wondering if these ones might work just as well as the 'pet store' variety heat pads...except way cheaper.

This is the first one. It just seems handy that there's a temperature dial right on it. I haven't really seen anything like that around here.
Adjustable Temperature Reptile Heating Amphibians Mat For Pet Snake Lizard 14W | eBay

or these, regular "plug into a thermostat" type
Heat Heated Heater Pad Bed Mat For Pet Reptile Amphibians 15x28cm, 110V, US Plug | eBay