We have the 33C, which is almost the same as the 35K without the extra 1/2 bath.
The fold out seat is not any harder than the non-fold out seat. With the front sofa FP, you loose the end table next to the couch (there is also an outlet there, which we use for the lamp on the table).
Since it is mostly just the two of us, we love the floorplan. We can both watch tv without craning our neck to one side or the other. We use one of the dinette drawers for shoe storage so they aren't all over the place and in the way and so we don't track mud and dirt through the coach.
The fridge is completely accessible as the L part folds into the rest of the sofa. We travel as much as we sit and the only inaccessible things on our rig when closed up are the bottom cabinet and drawers in the bedroom and the underbed storage.
We have had 4 people in our rig and the conversation flowed just fine. We have had 7 people in the rig and that worked too, with the front seats turned around. Also, because the tv is angled, most every seat has a view on game day. With the tv against the wall in front, viewing is a little more awkward.
The rear sofa FP actually has a longer slide; therefore, more floor space, not less.
We love our floor plan. After looking at almost every floorplan in existence, we wouldn't change anything about the one we have. One of the benefits of a separate area 'over there' is that, like now, I can work at my desk (the passenger seat with pull out desk) while DH is back in the 'pit' watching tv and playing video games. We have 'separate spaces' to do our own thing while in 34' of living space. Cozy but perfect.
