TX definitely makes a difference, I went from a 3PK to a DX3R and could not drive as I did with the 3PK (same chassis) I was better with the 3PK. Back in 2008 when I returned to the hobby, I purchase a RC8 team kit and really enjoyed it, but it was a pain to get to the diffs, sold it and got a MBX5R...easiest car for me to drive, very stable and predictable. for 2009 I got the MBX6 and it did not fit me, at the same time I got the Losi 2.0t and that was a great driving truggy hands down the best IMO, but maintenance was on the heavy side, at this time I also got a M11x, and driving improved a lot. Sold the MBX6 and got me a Losi 2.0b and got better, In 2010 I got the MP9 TKI and ST-RR and this year I am still with Kyosho they fit me just right. But like many mentioned practice and setup means lots, I spent days at the track setting up the cars, I mean hours and hours, till I feel the car is right for me.