I've finished with the quilting the RWB HeartStrings top and while I'm not really happy with it, it's not as bad as I thought. By the time it's washed and dried I think it will look fine.
I neglected to actually measure the backing provided and managed to run short. Thanks to a post on MQResource , I was able to piece the backing with the quilt still on the longarm. Let me tell you THAT was a big help.