I've got several races on the stock spur without a problem too. But I still like the design of the Exotek and being able to swap spurs easily.
While I haven't and don't expect to strip a spur, the one that comes in the kit is not exactly a precision part. You have to decide where you want to set your mesh and check it all the way around since it is not perfectly round.
I was definitely going to get the Exotek until I read about the noise level increasing after it was installed. Now I'm not so sure as I was hoping for just the opposite of that.
I'm having the hardest time finding stuff to spend money on with this buggy.
-Chris