I have the TRF511 and it is an incredible car - built like a tank and runs like a dream. The only thing that should be added is titanium turnbuckles. The ONLY weakness of the TRF511 is the open-diff concept. There have been a couple of manufacturers of diffs for the car, but it still tends to get too much dirt in it - this makes it alot of work to maintain. But the car is of INCREDIBLE quality (except as I said the steel turnbuckles). The race the hell out of this car and it never fails. I have broken the odd suspension arm, but this is no fault of the car (just my driving).
Get the TRF511 and you won't be disappointed.
As for the DEX, I just think it looks silly and it has some pretty astonishing weaknesses (someone mentioned broken axles and I have seen this at my track). A broken axle is just a bad sign.
The schumacher is a great car, but I have seen blown bearings on this car at my track.
Other than that, my second choice would be the Kyosho Lazer FS2.
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