This is our 8th season with our KZ Frontier; which is the pre-Spree model line. It has held up very well for our family and I would buy another KZ in a heartbeat. The rear slide mechanism is different from the Frontier's but you get a "king" sized bed that goes lengthwise in the slideout, not across like mine so nobody is crawling over the top of anyone to get in/out of bed.
Which Spree are you looking at? There is a 220s a 240bhs and a 265ksthat would all work well with your Suburban....Im just not seeing the 250 that you speak of.