I had a MR-1 skimmer. I didn't like it. I replaced it with a Euro-Reef and there is no comparison IME. I did work with Andy at MyReef and he tried to get it to work for me and I gave up.
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I have MRC's dual Beckett MR-7 skimmer. Finicky, but once dialed in it's absolutely marvelous. I've never dealt with Aquacave so I cannot make a comparison but I have dealt with some others and can say without reservation that the personal attention I recieve from Andy at Myreef has, so far, been second to none.