Yeah, isn't it funny how anecdotal evidence.. what you see, isn't necessarily matching the statistics. Here in Kansas, if you have an AD, it has an oil bath on it 98% of the time (Actually 100.. never seen one with non-oil). 5 window cabs are about 20% of all of them around here, deluxe heaters are about 20% as well. I look at the non-oil bath cleaner as a step up and far more desireable. What I need now is a bit taller filter to go in the ones I have. So little time, so much research needed!