I recently purchased an MSR Hubba Hubba 2-person for the first time of my boy participating in a scouts hike-in overnighter last year. He was a little apprehensive about going without me being there. So I popped for the 2-man. But we found out they won't give'em credit towards the merit badges if he's in a tent with me, so I ended up in it solo and it was great! I had been using an REI Quarter-Dome 1-man tent. It's "alright". But your abs get worked a lot in that thing, as it's small enough you can't quite comfortably rise to seated with forelegs underneath of you. And condensation inside that tent can be problematic. You've got to make sure non of the gear you plan on wearing the next day touches against the sides of that REI Quarter Dome or you could wake up to partially wet gear. Likewise with keeping your weapon away from touching up against the sides of that tent.
In comparison, that Hubba Hubba fits everything inside for 1P and with plenty of room to spare. And it's kinda helpful too if you didn't pick the absolute flattest spot to set it up at, as the extra room allows you chance to slightly rotate your pad and bivvy to adjust for gravity and pitch of the floor a little bit, which has proven useful for better sleep.
