i got a luba 2 and i love it. works nearly flawlessly. the little flaws aren't a dealbreaker and are more of a preference thing. also, did you feel ripped off when the luba 2 came out?
It's not that simple. Which one is better really depends on the type of lawn you have. If you have enough open area with a good view of the sky, then I would go with the Luba. If you have a lot of shade, then you'll need something with boundary wire such as a Husqvarna. Even this conclusion is not perfectly accurate, though, as I do not have a Luba 2 and so I cannot say how much better the RTK + Vision system is compared to the RTK-only system in the Luba 1.