Well, other than a sluggish EPG my MCE is working mostly brilliantly here in NZ and I'm over the moon about it. I have two Leadtek cards (DVT1000S and DTV1800H) and the only setup glitch was that first needed a Vista32 driver rather than the one provided with W7. The problem showed up as a random loss of programmed channels and the resolution for the issue was found on this board. The picture has always been great, nearly as good as the Sony W4500 TV.
Other than that, my W7 32-bit clean install needed no other Vista drivers to clear the device manager, something I think goes a long way to avoid problems. I've also avoided installing any programs I don't need for basic HTPC functionality.
The only other minor strange item is that the TV3+1 channel is found during scanning but has only 1% signal on the Leadtek cards while it works fine on my TV.