Looking for IPTV provider that includes "mostly" complete XMLTV EPG data

I'm looking for an IPTV provider that provides mostly complete XMLTV data for its channels ...appropriate as a fully usable TV Guide (to be able to schedule recordings).

...Or, if I were to subscribe to schedulesdirect, can I just replace any provider's incomplete XML EPG with Schedulesdirect's data-rich XML EPG URL.... and, expect the data to match up with each channel? Or, will I have to manually map each channel one-by-one?

Thanks in advance!