If you buy stuff from AliExpress & Co, you may get tools that work for a while, but never expect them to be the real thing - it simply won't happen. For some things it's worth a compromise, but if you are looking for Festool, I would buy from an authorized dealer to ensure I get the right stuff. Otherwise I could just as well buy whatever crap the local hardware store sells - it's probably better than the clones anyhow.