I was a big MT5 fan, and still think they make sense at a given budget.
That said, I had BOTH levers start leaking after a few years, within a few weeks of each other. Magura was great with their 5 year 'no-leak' warranty though. But I don't really trust the carbotecture stuff as much as real metal.
I also found them to need more cleaning/maintenance to stay decent than high-end Shimano's. Nothing crazy, but I'm lazy so I swapped to Saints/XTR 4 pots and no complaints (except serviceability I suppose).