Pros and cons of cycling to work and back 5 days a week?

Ride 30 miles a few days a week and a decent long ride on the weekend and then the 14 miles a day commuting are your recovery day. 14 miles a day is not alot your body should not really need much recovery.

+1 - especially when (I'm presuming) the 14 miles is split into 2 sets of 7 miles bookending your day. It will be ok for maintaining base fitness but far longer rides will do more, I think.
I managed to put weight on over the summer with a 34 mile per day commute, 5 times per week, which confused me. (I'm not sure how this bit is helpful)