we use the same ones at work. not had an issue with them yet.
I have one very similar and its lasted about 3 years.
Cant complain at that price
I got a similar one free with my welder and it works fine.
Got one new a few years ago for £14 at a car booty, still going fine. Only had to change the clear screen because of spatter form using gasless wire.
I have the exact same unit, now about five years old and still going strong, one of my better, (read cheaper), buy's. Cheers Ray