Good points. Who knows, you might have a bad copy of the 60XL, it can happen. Most find it very sharp on 60 or 80MP backs. Mine is.
I didn't really overlook the FPS, as it's limited to Alpa mount only, as an Arca user I guess I am looking for a more universal solution. Something like the current electronics on the market, but with more range in speeds. What little that was per-released on the DHW version seemed to show promise, but the 2K cost per shutter, was not going to work for many.
Also I know the FPS has a a lot of lens mount options, but with the 28 Rod and 35 SK can you still have tilt? I just don't know enough about it.
No doubt right now for more variety in shutter speed options is seems to currently about the only game in town, and if I had already made the investment in Arca R mount, I would be definitely looking at one. I could have kept my 17mm and 24mm TS-E lenses!
Hopefully Arca and Cambo are working on something similar (frankly I am surprised neither has), but with maybe a more realist cost of entry, i.e. less than 8.5K. (that was the FPS price last time I checked).
Paul