Well, I only own the Sportmaxx, out of the ones you listed. I do have some air leak issues. But other than that, this is a really great model. It is fast. It is pretty stable for its size. I run on grass most of the time so I can't hit turns at full throttle, but it does good. I was surprised how well it will climb for 2wd. If you are not trying to climb something like a pill of gravel, have not tried yet, it does well. It will flip before it loses traction. And yes when you have it in tune it will wheelie on command. Whats really nice if you watch what your doing with the throttle you can control the wheelie and make a good ride out of it. I like the single speed tranny. Has a lot of punch out the hole. It is slower than a T-Maxx since it has the two speed. But you can get it and install it later, as well as 4x4 and reverse. But several people are getting the T Maxx and getting the Forward only conversion because of idling issues and takeoff trouble. Also the Sportmaxx is identical to the T Maxx except for 4x4, 2 speed tranny, and reverse. It is a very good truck. The 2.5 has tons of power, but a lot of people have had a lot of trouble with them. They are replacing them with different motors. The Siro 18 seems to be the engine of choice right now, unless you are planning a .21 conversion on it. Plus there are also tons and tons of hop ups for the Maxx's out now.