I've had good luck with the shoebox. Tom is great to deal with and I'm a sucker for good parts support. It's a relatively simple machine to understand and use.
I do not like the spring style shutoff and so far my electronic shutoff hasn't proven to be much of an improvement. Time will tell, but shutting it off manually has never bothered me either. I doubt I would trust a shutoff on any equipment dealing with HPA just because over charging is a whole lot worse than checking on it from time to time.
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