I'd go with the 511 .
I don't own one and Haven't tested it either .
I have seen it close up . & thought it was a good evolution over the 501 . Tamiya Seems to Fixed all the Flaws & imperfections on the 501 and came up with the 511 .
Don't get me wrong ; the 501 Handles Like a dream . But the 511 seems to be easier to work on .
Again I haven't had the opportunity to drive the 511 . so can really say if it's better or not . The guy that owns it said the 511 was better ( he has used both )
hope this helps .
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