Anyone got a fanatec shifter? looks a well made piece but not so sure a dual use shifter will be as good as a dedicated sequential shifter.
I have no experience of DSD so can't comment on that, but I do have a Fanatec Clubsport shifter which I have used for the last 5 years or so with no issues - it is indeed well built and has been faultless so far. The ease of changing between H-pattern and sequential is nice (just a simple switch), and it feels much more solid, and with a more positive action, than the Thrustmaster TH8 which I have also tried. The one thing I don't like is that the throw in sequential mode is a little too long, but for me this is no big deal, especially as most of my racing (probably about 80%) is with H-pattern. But yes, I'm sure a dedicated sequential shifter would be better in this regard.
I would not have thought multiple shifters would cause a problem, but you may need to go into your Windows hardware setup and disable one or other of them before starting up the sim. I sometime need to disable my wheel when I want to use a gamepad for other gaming for instance. HTH.