The short review on the Techko Maid RV212 is that it isn't very good. Online users give it reviews that range from middling to horrible. So unless you can pick it up really cheap, you should avoid it. The good news is that the manufacturer is no longer making them, so if you find one it will probably be a used robovac bargain, so if the price is low enough, you may want to check it out anyway.
Techko's ads show it running around the floor looking cute and saucer-y, but user reviews suggest that this is because that's about all it does. It loses its way, looping around in circles. It doesn't so much suck up debris as it spreads it around the house, like a small tornado rearranging your dust in interesting patterns. In theory it can handle a variety of floor types, but it apparently doesn't handle them very well. Techko has other robo-cleaners on the market, so this review doesn't necessarily reflect on those, but there's probably a reason this particular model has been discontinued.
Robotic vacuum cleaners have been popular since iRobot jumpstarted the market in 2002 with its Roomba line of automated vacuums, so it's no surprise that there are plenty of competitors around at all levels of quality. If you want something that's guaranteed to do a good job, go for something pricey, like the iRobot Roomba 870, the Neato Botvac D5 Connected or the Samsung PowerBot Turbo 9350. But the Techko Maid RV212 should be avoided at all costs. Well, maybe not at all costs, but at any costs greater than the amount of money you're currently carrying in your small change drawer.
Work well but need to check power and schedule time for charge.
I got this little robotic vacuum to cut down on how much I had to sweep, and it does alright on hardwood floors.
On my tile floor it worked wonders and with daily use I no longer have to sweep! I do charge it nightly and I do have to charge it myself.
I bought one of these and gave it as a gift. It is okay -- not great, but okay.