If you want to go the Group Buy route. I would suggest you FIRST get at least 10 people to commit and willing to pay up front and maybe wait for a few months if not longer, then contact AMR saying I have 10 people ready to put money down. But, Good luck with that...
Maybe his lead times are better now that he has a bigger facility and more years in experience, but in the past they were sketchy and went longer than expected for most customers. Understandable since they are made to order.
He might do a group buy for this site again, Might not. Some members on this site left a sour taste in Andy's mouth.
However, for the money, he makes a damn fine coilover.