I like the Sabertooth, I have one in my 1/6 scale hetzer, but that tank also has an IBU for all the rest of the functions. It's actually a fairly versatile board and I have the servo on the barrel recoil circuit set up pull to the trigger on the .50 caliber paintball Cannon and what used to be Barrel elevation Now controls Traverse on the remote operated machine gun. Actual Traverse and elevation for the main Cannon are both controlled with pots on the transmitter. Anyway, I picked up a brand new M5 Stuart, still in the box, but it's so light that I'm pretty sure an IBU2 Pro will be able to handle it on a 3s lipo. At least I'm sure enough that we will eventually find out, if of course, I ever get around to this project. Still working on the King Tiger right now. That's almost ready for a build thread.