I love reading all these misstatements!
Unless you are running on a daily basis or are the owner of either or the machines in question (eg the guy that signs the checks) why even bother comment? Clearly Chicago, KR3, Won, eazyEd and I are running the Jetis, and it sure seems to me that we're all very pleased. There are a few others here as well.
The original poster asked for an opinion on a production machine in a production environment. The Gandi is a true production machine. Just a little basic mechanical experience will tell you that it's built to a more industrial level than the Fuji. Look at the machining, the joints in the frame, the cable and board attachments, etc.
Then, the original poster said he (she) was printing non standard substrates. I think I have put everything I can in my Jeti. I don't know about the fuji, but I have made my machine print things that probably were never conceived when the machine was designed. Any number of jigs can be engineered and used on the jeti. Right now we have a clamp down fixture in the works that will hold tensioned, odd shaped pieces down to the table, without putting mechanical fasteners into the bed.
Sure, some Gandi owners have had issues with their machines. I know many of them, and yes, they are serious issues. Most are being resolved by Gandi so far as I can understand.
Bottom line for me is that we made a huge investment, and it's paying off. It makes fast, beautiful prints on a huge variety of substrates.
anyone can feel free to PM me with questions and you are always welcome to stop by my shop and check it out.