Not who you were asking, but I use a Waterpik WP-100 and I'm very happy with it. According to my dentist they are less effective than normal flossing, but I hate flossing and was never able to do it on a regular basis, whereas I use the Waterpik once a day.

I worked my way up to a fairly high pressure and it regularly removes stuff that I missed with my electric toothbrush. It also leaves you with a very fresh and clean mouth feel.

I also wasn't very sure about them when I first looked into it, but it's really not a snake-oil product. It's also not the holy grail of dental health, just a reasonable alternative to flossing.

How do you clean these out? It's gotten backed up due to water deposits and no longer gives the nice pressure feeling.

I haven't had that problem, but I'd say flush it thoroughly with white vinegar and possibly replace the tip.

Depending on how quickly you lose pressure you might also consider using it with filtered water

I have a Waterpik cordless and it has been very good - the industrial design is meh but it does the job. It's nice to have a simple handheld unit. I have some gaps between teeth that can trap food and cause gum disease.

It's used in combination with brushing, of course - water-pik then brush.

It's a WF-02 ... it's the kind with 3 AA cells that I have rechargeables in (this is better for my bathroom setup).

I have the cheapest Waterpik and it's still amazing how much the water jet helps with dislodging various food bits trapped between teeth.

A bit late on the reply, but mine is a Sonicare Power Flosser.

I use Panasonic EW-1211W. Much better than brushing.