I just got the 12.9 this week and don't see the issue using it in bed or on the couch. I'm loving the huge screen. When I'm in bed I rest it against my thighs/knees with my knees up and on the couch, I either have my knees up or I have it resting on the arm of the chair or have it on my lap angled with the keyboard case. I can see it being an issue if you're trying to hold it the entire time though. When I'm walking around the house, I switch to my phone. I took it out last night to get a Pedicure and used it while sitting on my lap. I don't see ever going back to 9.7/10.5 unless I decided to get both.