I can give you my $.02.
The new Mark II really is more powerful and I feel it will solve all the stalling issues some users were having with the original. I can run it at speed 3 all day long and it won`t stall on me. It`s very smooth and not as high pitch sounding as the older tool, but I don`t necessary feel it`s any more "smoother" the the original. The speed control is very linear though and the new rubber stop on the back is great.
While the BOSS may be slightly out gunned in power now it still has many features I prefer over the Rupes, and it just "feels" better in my hands. It`s ergonomics simply work better for me, I can`t stand slow start features like the Rupes has, the BOSS trigger is variable (albeit not as good as a rotary), I love the rubber grips, and the quick access brushes should be standard on any tool. I don`t really consider warranty a factor but I know it matters to a lot of users. I do dislike seeing some of the failures online since it`s release but all 3 of my tools are still working perfectly, 2 of them after 16 months now. You can also find a post for any tool with some kind of complain or failure, though to my knowledge the Rupes ones have all been pretty minor dealing with cords and speed controls. With the polishers on the paint (Mark I and BOSS), I found the difference in smoothness between the 2 negligible, others may agree or disagree but that was what I felt and also what my wife and buddy who doesn`t detail felt when I let them compare the 2 sets of tools.
The new Flex is intriguing, but probably not one I`ll consider trying at this time as my Rupes and BOSS tools already do the same thing. For that reason and the fact that I haven`t used or even held the new Flex I can really only give opinion based on other Flex tools I`ve owned. While it was a very solid machine, I ended up disliking my 3401, which is why I sold it after 18 months, but I absolutely love my PE14 rotary and you couldn`t pry it out of my hands if you tired! I would expect the new Flex DA to be just as solid as their other tools and the compact, lightweight design is a definite plus. If the power is there I think it should be a serious consideration for anyone looking at a 15mm tool. If you use and own the 3401 it should also feel right at home in your hands...I know it`s briefly awkward for me switching between the Rupes and BOSS so that`s something to consider too.
Hope that helps.
Rasky
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