Well... I own Griot, Rupes and Flex machines and each has there strength.
Rupes is coming out with their MkII versions of their long throw machines (taking preorders now) to address the pad (backing plate) stalling issues that so many have had problems with.
Not that the machines stall with every owner, on every vehicle. But they do at times, especially so with curved panels, and even worse so with concave curves. Actually even the 12mm throw Duetto will stall, just not as bad as the larger throw machines.
Basically, the larger the throw, the greater the chance of stalling. Again... doesn't mean it will 100% of the time, but with a 21mm throw you can bet you'll see it happen.
Were I to look at the new Griot BOSS machines, I'd go for the 15 as I just don't need the extra throw of the 21mm machine. That machine is said not to stall like the Rupes.
And if that isn't confusing enough... you also have the new Flex 15mm long throw machine coming next Spring.
That and a lighter version of the 3401.
But let's get back to your original question.
Would you like the current Flex 3401, AND will it do a great job for you OR would you like the current Rupes 15 or 21?
For all out smoothness (with the above caveats included)... the Rupes 15.
For the ability to correct anything, at any angle, any shape, compound or convex curves..... AND with an available interchangeable backing plate system allowing you to run from 5" to 6½" pads the Flex wins hands down. :dblthumb2:
For something with a lifetime warranty, and (at least for me) turns on every time I pick it up... you can't beat any Griot machine. The GG6 is a great buffer, and has corrected tens of thousands of vehicles of all sizes to perfection. It also has the ability to run small pads to large pads with a simple twist of a wrench. I suspect the BOSS 15 would be my choice over the Rupes truth be told. Although I suspect the new Flex long throw to win out come next year (because I really don't need another one now).
