Keep those Oxygenics receipts, if you don't have your receipt they won't honor the warranty. We had one, loved it at the beginning, then it just started getting crummy and kind of spitting water out. Eventually it just gave up and blurbed water out. Since the whole thing is sealed pretty well, we never cracked it open to try to fix it. Our receipt was long gone, so Oxygenics wouldn't help us (or even give us tips on how to open it to try fixing ourselves). It finally bit the dust when we were on the road, so I picked up a low flow Waterpik brand one at Wally World for maybe $15. We've been running happily with the Waterpik ever since, and it has been a couple of years. DH and I both feel that it is every bit as good a flow as the Oxygenics had been...so our temporary fix has become the permanent solution.
So, I'll say that I was an Oxygenics convert, until I wasn't ;)