We had a bumper crop of pears a few years ago (when I was just starting to make cider) so I decided to make a Perry. It was just juiced pears and yeast and the end result was quite underwhelming. Not a lot of taste left... a bit bland with no complexity, although I was using EC1118 at the time which probably stripped a bit of flavour. I think that commercial Perry is similar, so I am not a fan.
However I have found that adding about 10% pears to 90% apples produces a cider with just the right amount of residual sweetness. I think that it is due to the higher levels of non-fermentable sorbitol in pears (they have 4-5 times as much as apples, i.e. 2-2.5g/100g), but there might be other reasons.
I guess you could call it "pear cider" because I make my "cherry cider" the same way (about 90% apples then 10% frozen cherries into secondary... freezing naturally breaks the fruit down so the flavour is released).
This approach works quite well for bottle carbonation since you can ferment right down and not lose what seems to be the residual sorbitol sweetness. BTW it seems that some dried fruits also have quite high levels of sorbitol, with Apricots, Plums and Cherries being in the range 4-7g/100g, but I haven't tried using dried fruit.
Extracting your own pear juice is a bit messy as pears are quite soft compared to apples and you end up with a lot of squishy pulp rather than pommace. I found that a firm pear such as beurre bosc with a flesh similar to an apple is the best way to go.