I have had the AE RC1212r5 and 5.1 and have now moved over to Xray for the 12th. To look at there is very little difference in the two kits just shape of parts but layout is nearly the same. Too be honest back to back I would say they also drive the same IMO. I like the T3 so thought I would stick with Xray for my 12th I also think the X11 is better quality and goes together well.