The roadside slide on our 2012 HR Endeavor 43' DFT is a full wall slide. When extended, it moves the "J lounge", the galley, the refridgerator, the washer/dry and the bedroom "dresser" cabinetry" out about 20 inches.
Combined with the two curb slides (a living room slide that contains the couch and dining room table - and - a bedroom slide that contains the head of the bed) - it opens the coach up nicely.
We haven't had the coach long enough to have much of an opinion about durability/reliability - but can say that for us, it's a case of "so far, so good!".
When all the slides are in - there's a narrow aisle that runs down the center of most of the coach. Moving around in the salon is no problem. Access to the mid-ship bathroom is fine (albeit a little tight). Access to the rear bathroom however requires you to climb over the bed. So far, we haven't found the "crampedness" of closed slides to be much of an inconvenience - and absolutely LOVE the space we have when the slides are out.