Both cars are similar in terms of suspension and weight distribution, obviously one is shaft and one is belt drive. The D4 is an unknown beast right now, though the price might be significantly less than the 501X - it remains to be seen. The 501X is hardly a proven winner as its also very new, but its a strong and well thought out car.
If your local shop sells HPI then I would imagine they will do the D4? HPI/HB seem eager to push this line, or at least it seems so.
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