Well I have an 8103, wish I had a 9303, and I didn't buy it for the T-Rex. I bought it for my Raptor 50. Course within weeks I had retired all my 6 channel radios in favor of the 8103. It's nice to use the same Tx for all of my models, 2 helis and 4 planes.

The 8103 is cheaper than the three 6 channel radios I had previously purchased anyway and with the increased features I wish I had bought it sooner. I really like all the mixing I can do for my planes with the 8103.

The 6102 is a nice radio, I have used it and my buddy uses it for his Rex, but it pales in comparison to my 8103. My 8103 makes setup easier as well IMO.