None of them were mine just what I saw from race days.

They never held a tune, and I never saw one perform even like an average motor, but this could be due to many variables. All I can say is GO has not showed me anything to like so far.

I do like how they come with an extra con rod but that just makes you wonder why.

For the price Werks motors I'd rather go for that, not just because the price but because Ron's customer support is amazing. He posts on the forum quite frequently and on top of that you can call him!