Hi I had a Subway in my vampirized 600, and had the really bad idea to replace it with a Rapidroad USB. On the paper, and in the first try too, the Rapidroad is a very nice thing. With the Subway I had about 700 K/s transfert speed, with the Rapidroad I had about 1.5 Mb/s. The big problem is that the Rapidroad stopped to work just after I plugged a simple (and working) USB stick. I borrowed another Rapidroad by a friend that had a spare one, thinking it was just bad luck with a bad model. 2 days after the same problem happen with another (working too) USB stick. I know that I'm not the only one to have this problem: at a party I meet someone with exactly the same symptom.
I have now 2 non working rapidroad that I sended via the resseler to Jens, and I have no news since October 2016, still waiting. The worst thing is that my Subway refuse now to work in my system, it is not recognised anymore, despite it's work in another machine (so I know that the Subway is working). My understanding is that the new poseidon installation provided by IC on the wiki aimed for the Rapidroad don't allow anymore the Subway to work. I spended many hours on this, and finaly I decided that because the LAN / FTP solution between my Mac and my Amiga, I don't need an USB solution on my 600 after all.
My advices are :
1. if you have a working Subway, don't touch it, don't try to install the Rapidroad, don't install the IC poseidon version. You will end with a non working system
2. don't buy the Rapidroad. It's simply a pièce of non working crap, and it will give you only headeaches. IC didn't assue his customers support and tanke month to send a working hardware back to you (if it's append once).
My two cents