Yes, I've tried them... ONCE!

They are about 25% - 30% less than Wolf. However because they're overseas, it takes about a month to arrive. And because I have a lazy mailman who fails to leave notices I find myself having to follow-up on the shipment only to find that I need to hassle with picking it up at the post office.

Even still Wolf is not that great either. Eventhough they're within the same state as me, they still take almost a week to arrive from when I order it. In contrast, I ordered XRay parts from Nexus Racing Wed. and got my order on Fri. and they're somewhere in GA, why are they so fast?

As for upgrades, the only ones available are either Wolf or K-Factory (TM same difference) and they're quite pricey. However, if I have a Serpent or XRay or Tamiya, I have a bunch of different aftermarket choices like 3Racing, CSO, Atomic, and etc all at very reasonable prices.

Do I love my E4JS? Yes! Do I hate the parts support? Yes, most definitely!