I think you're getting too discouraged but I can totally relate, I own a MB560. Everytime I go to cook, I wonder if its going to launch. And during the cook, I wonder if its going to make it through the cook. So far, its only failed me once but there's plenty of reason for doubt.
And I know its not gonna last for the long term, or maybe even the short term.
But I was so impressed with how it cooks, I spent a sizable sum of money on an Assassin 17 gravity feed that's being built for me now. There's a big gap between the MB GF's and a quality dependable GF that's not too expensive. Somebody needs to fill it.
I don't know what I'm gonna do with the 560 when the Assassin gets here. The used MB market is weak for the seller. I don't think it'll bring enough money to make it worth the hassle of selling it. But I won't have room on the patio to keep it for very long.