I got it!
Ok, so far I really like it! The gems are CHEAP and I have already used the toll to do other stuff besides adhere the gems. The colors of the gemms are great.
You need tweezers to pick them up and put then where you want, then just push the button and press on the gem, the glues melts a little under the gem you can sort of feel it, it gets squishy.
Then it is DOWN, there is NO MOVING IT!