Having used a '15 (I think) 13" Pro for two internships, I actually found it met my needs really well. I personally can't stand any 14"+ laptop, so the 13" Pro hit a great spot for me of being:
* Svelte enough to watch Netflix in bed with or throw in my bag to take on a commute
* Powerful enough that I never had major performance issues when plugged in at my desk at work, driving an external monitor
I look back on that machine and those internships fondly, and I could see myself going for a 13" MBP (or 14", if they ever release it) when I next need to upgrade my laptop - after I finish undergrad :)