At the ToothyGrinsStore blog, I wrote a very nice post that explains why the Hydro Floss is different than other oral irrigators.
You can find that information here: http://blog.toothygrinsstore.com/2012/12/hydrofloss-is-different-than-water-pik.html
Speaking as the author of the book: What You Should Know About Gum Disease I can only tell you that this is an exceptional tool that I think every family should have.
If you have or want to prevent periodontal issues, this tool is perhaps one of the most helpful I have come across. It has helped a tremendous amount of people over the last 20 years or so.
It is not like other irrigators. I am on a kind of personal mission to help people understand what this tool is and what it can do for you.
PS: You might also be interested in this video
*I speak in general terms only, specific questions about your unique dental health situation should be directed towards your periodontist or dentist.