I (TR’s Missus!) did the Dore to Man Piccadilly commute for about 6 months. It was about 3hrs traveling a day (inc the drive to Dore station and back).
Good points:
Gorgeous scenery
Train was really reliable (even when it snowed and my Manchester-based colleagues couldn’t get to work)
About an hr each way to read/work/snooze etc
Lots of regular trains (beware there’s a slow train and a fast one!)
There was a group on the train (who I didn’t quite manage to infiltrate) that got pissed on wine every friday and got picked up from the station. Massively funny listening to them giggle once a week!
Bad points:
The price! I commuted about 8 years ago and cost £15 per day then.
Time – 3hrs a day adds up!
Peak times – sometimes there wasn’t enough seats
Parking over the road from the station was sometimes quite full
Hope this helps!