I have XM and they do a great job on "The Village".   My complaint is that they do not have enough new releases.   They have a wonderful mix and they also broadcast concerts from the BBC as well as "Folk Stage" from WFMT. In addition you can hear Rich Warren's "The Midnight Special".

XM also broadcast Merle Fest this year and I understand they have several bluegrass fests in the next few months. I love XM!

I was not impressed with the folk offerings on Sirius which was the major reason I went with XM.