Bought an inline sprayer from them recently (mytee slimline injection sprayer, it's on mytee's website).
I was curious about the working pressures so I asked plenty of questions beforehand, stating that I planned to use it witha 135psi portable and would this be OK. He replied that "The manufacturer said it will work as low as 50psi" so I tjought great I'll have it.
Useless piece of poop just dribbles, it obviously needs to have a decent amount of pressure, I'd say at least 250psi. I even emailed Mytee and asked if this is correct. They basically told me to take it to pieces and check for any blockages!
Buying stuff that you know from an overseas company is great - as long as you know what it is, you've used it before or it's something that hasn't got the potential to be crap when you receive it. The postage is prohibitive to return things to the states for a refund, you might as well flog it at a loss.