I've owned 2 of the SinuPulse machines. The first one died after several years and I purchased a new one. I thought it worked well as it pumps more saline through than the squeeze bottles.

Before I became aware that these things should be sterilized I did what you did. It's been awhile since I have used the SinuPulse. Now I use the Squeezie which I learned about here. It might be other changes I've made in general, so hard to say, but with the Squeezie I seem to get fewer sinus infections (knock on wood!)