I've had the 360 a couple months,I had the ultra before this one the electric cord burned out.I keep mine plugged in until ready for use after filling it twice becomes weak roughly 1 min
The only thing I highly dislike is the blue water tank! It is impossible to see the water level when filling, thus usually over filling it. A clear tank would easily solve the problem.
I have a small bathroom with very limited space. I love this Waterpik because not only does it take up little space but I can take it with me anywhere. I ordered a travel case to make carrying it even easier.