Why did you have to wait 18 months for delivery?
I placed the order for my 480B in Dec 2006. A few months later, Enstrom announced the availability of the Chelton EFIS/FMS, and I changed my configuration to include this. As things turned out, it took Chelton and Enstrom considerably longer than anticipated to obtain FAA certification for this configuration. Thats history now and new 480's with the Chelton system are available in a much shorter time frame. IMO, it was well worth the wait.