We ordered our 21QB back in July, but it was back ordered and so we had to wait until just a week ago to go finally pick it up. We DO love it! There are many perks of the Jay Flight version over the SLX... my favorite are the larger fresh water storage which is awesome for nature boondocking (90 gals) the larger 8 cu ft refrigerator, and yes the cabinetry is nice, totally loving the upgrades. We have both the Customer Value package, and also the Elite Package because now those are both mandatory... you get them no matter what. We are super happy with our purchase.
We bought ours from RVDirect - it cost us $14,675 total (including shipping fees too and our upgrades of the 29" LED TV and the roof ladder.)