I've enjoyed using mine. Used it to spare Valspar Tractor & Implement paint, thinned 5-10%. Also sprayed some Rustoleum Hi-Gloss Red from a quart can, thinned a bit more though...
One thing I knew going in was that they use silicon (seemed like caulking) to seal all the threaded connections inside the gun. Took it apart, cleaned out the silicon pieces that squeezed out and used Teflon tape to seal the threads instead.
This guy had a pretty extensive YouTube video on it.
The 1.4mm tip was pretty small for my paint and I had to move fairly slow when spraying. Your mileage will vary.
I've cleaned mine a few times now and plan on keeping it awhile.