I have Siamese installed on my Amiga 2000 with a SBC installed in the same A2000 tower (powered by the A2000 ISA slot), with the Siamese video switcher card installed.
Sadly, I really just use the video switcher now; actually, mounting the PC drives via the Siamese system was pretty convenient, but you can arrange that with a regular network. The cut and paste function between Windows and the AmigaOS used to come in handy, but I have not used it in a while. It just is cool to be able to switch between the Amiga and Windows with the F12 key.... Although, again, with a video switcher, it is more of a cool hack.
I was never able to get SiSys RTG to work properly on my Amiga 2000 (to open the Amiga screen on Windows)... I bought another Siamese video switcher card, but never got around to installing it into my Amiga 1200 tower. I guess I will eventually though.
Roy