We have been very happy with our 259BHSS so far. Everything is working...no issues with the slides or leaks. Had it in for service 1 time to fix a seal (had come unattached, but not leaked) and had an issue with one taillight which actually turned out to be a non-issue (connector in the pigtail just needed bending for a better connection).
When the slides are in, both the kitchen slide and the dinette slide almost completely butt up to the island on both sides....no room whatsoever to get thru. From the front door, you can still access the front bedroom and from the back door you can still access the bathroom and somewhat get to the bunk areas. You will have NO access to the fridge or kitchen area and limited access to the storage areas surrounding the dinette.
We had done alot of research before buying...its overwhelming as there are so many options and choices. After a while, everything starts to look alike.
The double wide bunks were a big deal for us...my 13 yr old is 6'2" and needed the extra space. Also, having a full wall and real door on the bedroom was a big deal for my wife and I. The island helps with 'traffic flow'....its easy to be on the kitchen side cooking or washing dishes and others can still walk thru the camper on the dinette side of the island without getting in the way.
We were limited on length/weight by our tow vehicle....the compromise we had to make was giving up the couch. Actually miss this more than expected....We spend most of the time outside, so not a huge issue, but there are times when it would be nice to have. We do take the table down and use the dinette area just as a sitting area occassionally, especially if watching a movie.
We thought that the 2nd entrance coming in thru the bathroom was a MUST HAVE when we were shopping. Reality, not so much. RARELY ever use it. Everyone uses the front door. I would have rather foregone that second door and had extra counter space in the bathroom.
Overall, very happy with our purchase!!