I got the Spit package installed. It went in very easily from disc with none of the problems described in the "Speaking of RealAir" thread. The disc arrived very quickly and in mint condition complete with pilot's reference printed on real paper. Funny how retro that seems nowdays.
I haven't spent much time with the XIV model, but I have "flown" the IX several times and it is sweet. Very easy on frame rates as well, which is a big consideration on my aging computer. For this model alone I would recommend the purchase, but in full disclosure, I wouldn't have this a/c if not for an unexpected gift. If you can find one for sale online at a reasonable price, definitely get it.
I am now seriously considering getting a MK.1A, if and when I have the money. Either that or a good Hurricane. I have a soft spot for the Hurri. It's the first model plane I remember building, purchased across the bridge in Canada. To me, the Spit and the Hurri are the Mary and Martha of the Battle of Britain. It's like a family that has two daughters, one very dependable and hard-working, but with a scalding hot younger sister who gets all the attention.
Thanks to all my Sim-Outhouse buddies for responding to this thread.
JAMES