I have had the WP-100 for about 1 month. This is my 4th WP. This one is very good. As in the past, my mouth feels very clean after use. Since I began using the WP, I always have good checkups with my denist. I wish the reservior held 800 - 1000 mL. Otherwise very good.
At the suggestion of my Periodontist, I purchased this WaterPik Water Flosser and wish my General Dentist would have recommended this a long time ago. I've only had it for 3 weeks and, while not proficient in its use at this point, I don't think my gums/teeth have been this clean since my last Dental Hygienist cleaning about 4 weeks ago. Great product and I highly recommend it to those that are still using string floss!