The only real 'problem' I found when I had a D4 was HPI/HB and the lack of support. That was when it was still in production!
Never had any diff problems, and never really found the slipper an issue with either version (ran original and WCE versions) but I did find the front shock tower rather fragile. Beefing up the tower just meant it snapped front bulkheads instead. Since HPI rarely imported D4 spares, that meant a wait of several weeks for replacements.
If the car has a couple of spare front towers and bulkheads, its pretty much sorted. Although its now considered an older model, technically its based around the same platform as the B44 and is quite capable of competing with it.
Rumour has it the Caster SK10 is based off the D4 and D4 parts fit it. If this is true (and I can't say either way) then Caster spares might solve the D4 parts issues.
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Yz4 - Yz2
DEX210 - Cobra 4210- DEX410
RC10 Team - Manta Ray - RC10T
Mini Trophy - Blizzard - Wheely King
Tz4 - GT24B
BMRCC
Emergency back-up race controller
(but only if nobody better is available)
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