Hey Marty. Am pretty sure this is an update of their original FS9 release from some time back. Looks pretty much identical to me, don't know if any of the systems or level of simulation have actually been updated since then.
Here's a review of the original from back in 2009...
http://www.simflight.com/2009/11/29/rev ... fs2004fsx/At the time (and probably still now) the reference DC9 for FS9/FSX was the one from the MadDog crew...
http://www.flythemaddog.com/Not sure if the latter works in P3D though. Be interested to know.
I LOVE the DC9 but for me the MD80 series with the longer fuselage just looked BETTER, so for me I bought the CLS MD80 instead and rate it, even though its a mid-tier implementation really.