Review (5/5): Beats Hydrofloss
After two Hydrofloss irrigators, recommended by my dentist, I found this item far superior. Both Hydrofloss pumps failed with less than six months of use. Took it apart--cheap pump. The Glacier Floss relies on home water pressure, which is very adequate, saving parts prone to failure. Materials are of good quality and I have used it successfully for six months. And, it's half the price!
The only limitation is that you can't mix in peroxide or mouthwash, but since that is apparently not good for the pumps in the reservior type irrigators it may not be a good idea anyway. Oh, and of course, it's permanently attached to your faucet, but far less cluttering than the reservior style like the Hydrofloss on you sink.
UPDATE: Having previously bought replacement tips from the manufacturer, I find that it is no longer possible to contact them (website gone, numbers disconnected, no web search results). While their tips last several year their device last much longer, so you'll have to toss it or buy another product now.