As far as quality goes, I love my TRF501X (and 511 should be even better, at least it is a lot easier to service). I've got aluminum caster blocks, Kyosho ball studs and "hard" ball cups and titanium turnbuckles on my TRF501. I also have carbon fibre lipo trays (by Fredrik Emilsson), and gear diffs.
As for the 511, you might want to upgrade the ball cups to something better and get a lipo tray. Tamiya makes a lipo tray, but if I am correct, it does not shift the batteries location, which means you most likely need to modify the center bulkheads for lipos to fit. The tray made by Fredrik for the 511 shifts the batteries backwards slightly to allow clearance for the batteries, so if you use them, the center bulkheads don't need modification.
Also you might want the rear diff cover by Fredrik, depending on the surface you drive on.
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