I did a quick google search on the 6.0,6.1,6.1s and 7.0. they have 4 different sound sets. From what i gather they are the Tiger, Leopard,T90 and Abrams. CS-TK has 7- Leopard 2, King Tiger, Tiger I, M1A2, Bulldog,
Panzer III, and MAUS. The controller is obviously different, as far as control is concerned, I have only heard the sound packs and have not seen anything on them actually running. From a visual perspective the board does also look different. If I wasn't sinking $ into the two Sherman builds, I would bite the bullet and pick one of these up and give it a review. also to add I have seen these listed from different places and most of them list the price under $70 for transmitter and control board.

Wade