First gen 12.9": yes. Thankfully, it was also not compatible with school so it was easy to return.
New 2nd gen: no. Beyond the great new features, seeing it right next to the 10.5" made it look far less unwieldy. And it is a bit lighter too. For what I want to do and what the new iPP will do later this year, it made sense to try again. Glad I did. I will have no problem lugging it around the house, but I probably won't commute with it, given the sardine cranky chaos of my public transit commutes to/from work.
I regretted the 9.7"models I briefly owned, more than Mini 4 (which I loved) and the 12.9".