Bests & Worsts Reviews from Amazon

I've owned my Ultra Cordless for about 6 months now, and feel that enough time has gone by to write a review. Some of categories I have been keeping an eye on are: 1) Battery Charge Intervals 2) Reservoir Size 3) Jet Power 4) Ergonomics 5) Construction Quality 6) Corrosion at recharge terminal 7) Power Switch reliability 8) Noise 9) Transportability 10) Effectiveness of oral irrigation. 1) The battery charge interval is outstanding. I use the unit twice a day on average, and I can go more than three weeks between charges. Each use of the unit drains the fully filled reservoir. I let the battery completely discharge through use, then fully recharge on the charger overnight for more than 12 hours. 2) Rerservoir size, on full power setting, is more than adequate to fully irrigate for me. I find no issues with the size. 3) Jet Power, has two settings. I use the full power setting, and it seems to have enough power with a fairly strong jet. When I first started using the Ultra, I had to start on the low setting due to gum sensitivity. 4) The unit has a tapered area that makes it easy to hold. Also, the tank design weighs the unit such that it is comfortable to the hand. 5) Construction quality seems good, with quality plastics. It is made in China. 6) Corrosion at recharge terminal. The terminal socket has pins that are gold plated. Even though it gets wet during use, there is no corrosion in the terminal socket, as would be expected from gold plated pins. 7) Power on/off switch reliability. This is a slider switch, and it gets wet during use. It does not appear to be water proof by way of external examination. However, it is working fine after 6 months, and doesn't appear to be suffering any degradation. It is something I will continue to keep an eye on. 8) Noise. The pump makes noise, and any insulation would add weight. The pump is fairly powerful for a battery powered unit, so some noise is a good engineering compromise. I don't find the noise excessive. 9) Transportability. I take my Ultra on trips and use it at home. I take off the reservoir tank and pull off the jet tip for transport. The three small items can pack neatly in your luggage. I'm pleased that the unit is easily transportable. 10) Effectiveness. My gums are much healthier and exhibit a pink color. If you have red gums, then that means you have some infection setting in. Irrigating with the Ultra and using a small amount of mouthwash (like Listerene) kills plaque forming bacteria. The jet removes food particles and some of the mouthwash "chemistry" gets under the gumline to help preserve gum health. The niggles are that the jet tip rotates in its socket. You have to use two hands, one to hold the jet tip at the base, and the other to hold the unit. The jet tip should be keyed to the knurled collar. The power switch is a concern for longevity, but this worry could be unwarranted. It doesn't seem obvious how to replace the battery if and when it fails. Without the niggles, this could be a five star product, but I give four stars for a pretty solid showing.