I would say the biggest downside is the added weight, besides the cost. I would also say while I have been pondering a mopar IRS set-up for years, I would say this one is likely one of the better designs compared to other vendors decades old Jag/vett iterations, IMO. The choice of a Dana 60 also IMO is odd, a viper does pretty well in handing situations with a much lighter/smaller alum dana 44. I would guess they might in future add to the center sections offered. The price point would serve them better if they could get it to the $8K range, again imo. It has been well received by the few using it on the PT scene that I can see, but not sure ithey plunked down $12K either.