I don't have a clue as to whether the Hyla products are good or not. As far as I am concerned their HIRING practices leave a lot to be desired.
They advertise in the employment section for "air tester" and claim they pay $20 plus an hour. You go to an interview thinking you are getting some high paying, high tech job, when, in reality, the job is "sales", because if you don't make sales, using your own vehicle and fuel, by the way, you are not going to make that much money. I have been taken in by these false ads 2 times now, but I won't be again.
First time fooled, shame on them, second time fooled, shame on me.