Wasted money. The bushings that could possibly wear out are so inexpensive, that you could change them out every 6 months and still come out cheaper over the life of the TM.
Get yourself one.....bushings not the only issue here. Too many high priced electronic components taking unnecessary beating in rough waters.
I have had one since they were first out and have used on a Maxxum, a Fortrex and now my Ultrex. I have never had to replace bushings or had any problems with any of the motors!
Just Sayin.....