My woman likes Potomac. It is an Anjou class pear, and she likes Anjou. It is very, very fireblight resistant and of exceedingly high quality. I am just not an Anjou fan so I use it as a base for a multi-graft tree. Mine is on OHxF 282 and I have had it about 15 years. Either Rocky Meadow screwed up on the rootstock (unlikely) or the darn thing is very, very,very vigorous. Basedon what folks have told me it is vigorous and out grows any thing else. I can keep my pears on 333 at 8 feet easy,this thing I have had trouble keeping it at 20 feet. It has a very vertical habit and even fall prunings sends up watersprouts.
Looks wise,it is an ugly pear,but then I think all Anjou pears look like hobbit pears:dumpy little squat unattractive things.
That being stated if I wanted to grow Anjou type pears for market this would be it, as it has a great taste for a Anjou type and is ever so fireblight resistant. Also it has a biennial tendency at least here and I never have heard other people mention that.
IMO, it would make a nice shade tree if you wanted an integrated landscape.