The original guesttimate price on these was going to be around $60 due to their complexity. The materials may have affected the price adversely so we'll have to wait and see.
Blackandtan, one of the tests I did that failed the first few gears I had was to put pressure on the glass impeding the forward or rear travel slightly to simulate a track that has gotten dirty and unlubed over the years. The gears would last about 2/3 of a single pass on that test.
Rick