I have the 1455. Got it from Adam at Battlecorals around Black Friday, but only dropped it into my sump a couple of months ago. It's in a 40 gallon sump under a 220 gallon display.
Took a little while to settle in, kept blowing its own lid off, but it runs strong and steady now. Pretty new tank, with a couple dozen coral frags, a couple dozen CUC and no fish so far, but the skimmer still pulls some nasty out of the water.
The manual neck cleaner is a thin, rotating blade with a squeegee on it. You spin it, it wipes gunk off the inside of the neck, and you don't have to pull the cup quite as often. (I find that I want to pull mine about once a week.)
~Bruce