I have no a 511 and a 501x, but I have read their instructions, then I discover that there are so few differences between them, a 511 is very slightly better than a 501x, and the design of the upper deck of a 501x is much stronger than that of a 511, so a 501x may manage more rugged roads. Besides, it is nearly three years, that is a bit long before the next same driving system TRF car is released, since a 511 was released, so I think that the new TRF car is going to be released before long and now is the suitable time to look forward to it instead of upgrading a 501x into a 511. A 501x is designed for races, so of course is better than a DB01R. I should sell the DB01R keeping the 501x until the new TRF car is released. All of the above is my dull opinion.
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