Two more weeks left till I get my unit!
This is how I came to justifying the purchase. When comparing J30 to RTT, it has to oranges to oranges vs oranges to apples. CVT, Autohome, James Baroud and other hard shell/clamp type of RTT are the only RTTs that should be considered. The cost of those units on the average is in $3500 and up range. Then you have to add the cost of roof rack. Considering possible options for RTT and miscellaneous bits (taking into a count like shipping , taxes, installation) the total cost can easily reach $5000- $ 6000
On the other hand, the final cost of my J30 including matching paint job minus top lid , map pocket option , rear light option, front 12V and USB option, roof rack mounts on top lid, plus CA tax , plus installation = $7500. Then I get to sell my hard top lets say for $1500 . Now I'm at $6000.
After establishing the $$$ aspect of the comparison (remember oranges to oranges) between J30 & clamp type RTTs lets look at the ownership and use. As an advantage J30 allows you to enter/exit from inside the vehicle. That means using vehicles heater/a/c , deploying in snow/wet condition and standing up inside (big plus for me) is possible. RTT can not do that. Another point is that with J30 you now have carpeted hard top vs ugly, white interior of OEM unit.
Vehicle height: J30 adds 6" . RTT by it self is at least 7" then you have to add the roof rack height and possibly the height of RTT mounting hardware. That may add 12" to 17" to the total vehicle height. ALso the RTT and roof rack combo are not as air dynamic and may generate louder noise and decrease MPG in comparison to J30.
After showing all advantages of J30 and almost same cost in comparison to clamp type RTT to my lady, she gave her OK. Two more weeks left till I get my unit !