I totally agree with Boise Shark. I bought a non running '84 928 4.7 that was complete but needed everything. It didn't scare me because I owned many 944s and 924s before that. I dove in with a vengeance to learn and low and behold I had the old car running in two weeks.
Then I got wild. I figured I had a $1300 928S and a nice 944 so I would use the 928 as my play mobile. After doing my damndest to break the 928 and race everything that moved, I kept finding more $hit wrong with my 944 when I really babied it compared to the 928. So I made the decision that the 928 was a more robust, sophisticated, and higher quality automobile (as it is) and I let the 944 go.
I've missed my 944s at times, but with the power and sound of my '83 928S I really haven't looked back fondly on the 944s or 924s that I've owned. Even after buying my 911 T, I bought another 928 when I had other pretty nice 911s available to me.
I've now restored my '84 into a pretty nice car. I did the complete interior except the dash, timing belt and water pump, radiator, trans service, a tune up and a new old stock front spoiler. She's a little low in the front but I like her that way. To some people the 928 is complicated, but to me it's easy as pie. One can get all nervous just looking at the relay panel until you realize that 85 percent of it is useless to the cars running engine and transmission.
I've owned ten Porsches but my favorite to wrench on is the 4.7 liter 928. As Porsche's top of the line flagship model, the 16 valve 928 lives up to everything that is 911 and more. $hit, I'll blow a timing belt and be back racing the next day. Try that in any 911 and see how you fare. Try that in a 959.
I realize that its not a design feature as much as it is a fluke, but non interference is pretty exceptional in the world of expensive high powered cars. The 16 valve 928 is a beast unto itself and I adore it. The 32 valve is a bigger beast, but it comes at a price, and to me that price is not worth the hassle any more than the 944 is. I'm happy with the power of the 4.7. It's all I need.