I commute 140 miles a day in mine (round trip). Absolutely fine - I don't feel the slightest bit stressed or uncomfortable. Also - that commute, I did that in reverse for a while in an F-reg Mini Flame. I did Sheffield to Milton Keynes - you get used to it.
I would invest in a bluetooth-capable head unit so you can play your phone's music, but also look at your local library's web site. Many will also allow you to check out free audiobooks - well worth doing if you travel a lot. Podcasts are a boon as well.
Quick edit: I'll add that all that applies after I'd had the driver's seat bushes fixed so the chair didn't slide. Was a little disconcerting before that, so if that's a problem with yours - get that fix done first.
...and edit 2: thinking about it, I actually did that commute in a old S reg Leyland Mini 1000 as well. Now there's a car you knew you were driving.