I think that’s where a good part of the $8 monthly fee goes (and the fee for SD’s DVR product )…the guide data. I assume the delay in supporting other countries is so they can source good guide data.
Hopefully Channels can contract with the same source that SD has switched to for the UK. It’s pretty complete and accurate. I’ve noticed a few minor issues with some missing channels and logos, but I don’t know where to report it.
Beyond the guide data, there really shouldn’t be any technical issues to offering DVR in other countries. Though I hope Channels plan in the future to support some DVB-specific features, such as EIT p/f data (also known as ‘Accurate Recording’ in the UK).