I looked into one when we first got our 23B but the $750 price tag turned me off. If you were going to use your 23B on a seasonal site with the slide out deployed for 6 months at a time it might be worth it. I bring a stepladder with me and sweep the top off before retracting it.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.