I don't understand the complaints about the 30fps issue. NTSC standard is ~60Hz, interlaced, which gives an effective 30fps. If you play a console on a regular analog, or SDTV digital, TV, that's what you get as well. That's the signal coming from the console, if you're using a composite or s-video cable, or an RF adapter, 30fps, even if the console is running the game at 60fps. The limitation isn't the Gamebridge, it's the NTSC signal. For 60FPS, you'd need a VGA adapter/converter, or a progressive scan upconverter. For anything over 30fps (480p, 720p, 1080i, or 1080p), you need a component, DVI or HDMI connection anyway. I guess they could have designed the Gamebridge to do 480p deinterlacing, like a progressive scan DVD player, or 1080i upconversion, like some of the newer DVD players...
I'm also curious to know what kind of PCs people are running with this. I have an Athlon 64 3000+, 1GB of RAM, nForce 3-250 chipset, a Geforce 6800GT video card and a Sound Blaster Audigy 2 sound card. Also, earlier Pentium 4 chipsets only supported USB 1.1, which will be a big performance hit vs. USB 2.0, so I would be sure that I had it connected to a USB 2.0 port/hub. That's one of the frustrations of PC gaming, there are so many different variables.