I've used Shift+ already few years. I connected it to my Fanatec base same way as F's own shifters, I cut one cord from basic F shifter and then put wires together from Frex to that cord and that way I had proper Fanatec connector to other end to put it to base. And when connected via wheel base I can of course use it normally on console games too.
Only gripe with shifter is that there is that one nut in linkage which I have tighten up regularly.