I have a 2007 lance 1131 and it is completely usable with the slides in. We have 3 kids and everyone can sleep with the tent in even though it is tighter. I don't like the idea of crawling through the window so we don't use it like that. It's pretty easy to go through the door on the side.
We looked really hard at a motor home before this and thought that was the way we would go for sure. Make sure you test drive one with the kids before buying. We were ready to buy a motor home then drove it with the kids... they HATED it! it was loud, not comfortable for riding in the back in for hours and the kids got sea sick with the swaying. Make sure it's a fit for you before taking the plunge.
Let me know of you have any questions; I'm happy to help.
