Ed, it is! I purchased Dillingham almost the moment it originally came out, though I had forgotten about it for quite a while until I found it while going through my back-ups just the other night - as it always has been, a great little scenery!
Having had a long interest in autogyros (having seen a few in old movies), then being up-close in person with both the EAA-Museum's airworthy PCA-2 (parked/static), as well as seeing the airworthy ultra-rare PA-18 NC1267B actually 'in action', I just had to purchase the first/original pack that G.A.S. produced back for FS9, featuring just the PCA-2 at the time, which I really enjoyed then (and was especially impressed with the flight dynamics, being so close to providing the same qualities of the real aircraft). With this new set, just for FSX, and now featuring the PA-18 besides, it was another must-have for me. I would say, if you have any interest in autogyros at all, and/or just an interest in classic 20's/30's era aviation, this product would be right up your alley. I can't imagine anyone being disappointed with the visuals, the sounds, or the flight dynamics. It is a very sharply-executed and well-researched production.