I just installed the J Top on my 4dr BB. I'm enjoying it so far. I haven't noticed any major flapping but I haven't driven over 65 mph. I'll give a test during the next nice day. Closing the top does take a bit more effort/time than probably the Gearshade top but I'm sure with use it'll be easier.
I wanted a manual but went with the Mid package for the remote start, heated seat, and dual control AC. I love having those amenities especially during the Maryland winters. I'm sure I'll love the dual AC when the summer starts.
StickerFab has vinyls to add accent colors. I've used their BL orange for the exterior of my A51 BB. They can also match the interior colors. I love the sandstone interior.
The center console has a depression for a dead keyfob and still start the Bronco. I tried a couple times just to make sure it worked. I have the keypad and plan to move to the gas tank door.