IMO The Tmaxx was "copied" by Tamiya and AE. The TNX and MGT have the same type chassis set up. The Savage was "copied" by Duratrax and PRP. The Warhead and Raptor look similar.
IMO Great things are just improved on most of the time. Heck the 1/8th scale buggies are so dang similar.
Just a piece of inof for you guys.