Update.... pretty much a total fail.
Even though I set it up so DW didn't need to change sources, just switch between Fire TV apps, she struggled with the new setup and getting to the channels that she wanted to watch... but she may have got it with more time.
I was unimpressed by our trial of the Fitzy TV cloud DVR.... it is better than no DVR at all but is primitive compared to the Dish TV DVR that we are used to. Also, while I like Fitzy TV, it wouldn't show HGTV even though we have HGTV in our Xfinity credentials and it occasionally would say that CBS wasn't part of our subscription which obviously is. Good, but just not quite yet ready for prime time. I probably will use it for a seldomly used guest room tv and get rid of a SuperJoey and save $10/month.
OTOH, we really like CBS All-Access. Since with Dish we don't need CBS All-Access for our local CBS affiliate we will probably keep it for a while for its original shows that aren't available elsewhere. That costs $10/month so no net savings.
If Xfinity ever provides a streaming app that will work on FireTV then we may give it another try.
Luckily, out tv bill is only $65/month so it isn't about affordability at all but more just trying to squeeze out the best bang for the buck.