It isn't GOOD. But if you aren't leaving your printer running 24/7 (which you shouldn't, if only for power reasons), it isn't a massive issue in practice so long as the conveniences outweigh the risks.
I WOULD be concerned with the window between a print finishing and waking up though.
I bought from them knowing about the cloud service. These printers are fine for one off purchases, but I would never buy one if I were to set up a print farm. The parts are all reasonably priced, just don't know how long that will last or they may discontinue the model and stop selling parts for it.