For a few months now, I have been working on and off with some patches for the xc5000 driver to improve the tuning time. In the interest of making sure that my xc5000 improvements didn't break any existing products, I reached out to Pinnacle and they very kindly shipped me a sample Pinnacle 800i card, which arrived today.
Nothing beats plugging in a brand new PCI card, powering on your Linux desktop, and watching the kernel crash at bootup.
This is supposedly a stable driver, as the card has been supported for some time. My intent was to validate my xc5000 and s5h1409 driver changes to ensure there wasn't breakage, but I guess I'm going to have to do more than that. Fun fun.