mercedes sprinter chassis

I'm very interested in this topic because I've been conducting research for months on all the class-C's built on the MB Sprinter. I've owned several Mercedes diesel cars over 40 years and they all have been rock solid. On paper I thought the Tiffin Wayfarer 24WQ (queen bed in a slide out the back) would be my choice on the Tiffin reputation alone. It certainly has several nice standard features such as diesel generator, but it has practically no basement storage. Many other brands, such as the Dynamax Isata 3, do a little better on basement storage, but not much better, then I saw the Thor Synergy Sprinter SP24 (the same configuration with the queen bed in a rear slide). That model has a HUGE storage compartment that can be accessed from either side or the rear. Add their Summit Upgrade Package, and it still prices out way lower ($10 - $15K) than the Tiffin. It's my new favorite, but other Thor products have several fair to poor reviews. Thor makes the Sprinter C in three different price tiers, and Synergy is their "luxury" model. I see quite a few on the road. Are there any Synergy owners that can share their experiences with Thor's build quality and warranty service on the Synergy Sprinter? Much thanks!!