I am very satisfied. The mainspring housing is well thought out and perfectly executed in manufacture. I appreciate the little personal touch of M&Ms and a written thank you message from the owner. It's often the little things that make you feel like a valued customer.
I have tried other big name mainspring housings but this one seems best made. Just look inside the spring well, the finish inside is as good as outside! I have not seen this quality in other big name brands I have tried.