User tyre reviews for tyres on the BMW E38 7 Series:

Running these on the front of an E38 BMW - a big heavy car - I found the dry grip to be excellent - nice bite on turn in and nice progressive feel. Wet grip on damp roads is generally good. However, on VERY wet roads I've had a few scary aquaplaning moments, but this may be the sheer weight of the car pushing the nose on. The big problem I've had with the KU31's is keeping them balanced. They seem to go out of shape when the car is parked up for a couple of days. I've put about 10000 miles on these tyres and hope to get about another 5000 before changing. Overall a decent tyre for relatively little money but I will probably go upmarket for the next set.

This tire came to me through a friend's recommendation. I have always avoided Falkens for quite some time because of their noise levels. Since then I have been using Michelin Pilot Preceda 2, Continental Sport 2 and Pirelli 6000 on my 2 cars (BMW 735 and Mercedes E320).
I simply bought them because of a friend who asked me to try out on his BMW 530 with this new Falken tire (replaced his older Michelin Pilot Preceda). I was really impressed. I was not so sure whether it was totally his new tires or just the combination of his BMW suspension setup that made the driving experience so pleasurable.
Anyway, once I got the the tyres replaced with the Falken 452 on my own car, I felt almost the same kind of driving pleasure. The roadholding and comfort is probably the best I ever had on my BMW 735. The only thing about this Falken 452 is you would need to break in for about 100km before the incredible feeling of grip comes in. This tire is definitely not noisy at all like some older Falkens. It approached the 80% of the performance of the Pirelli PZero and Michelin PS 2 at less than half their selling price!

Another contrary opinion: I didn't think these were any better than the Continentals that preceded them. I also had my most spectacular near-death experience with them as they completely let go in the wet without the slightest warning.

They might be better on a smaller car, I don't know. I'm disinclined to find out.

On our V12 BMW, these tyres are shocking, really bad indeed. Even in the dry the car is easy to unsettle with the accelerator, and in the dry they are lethal, thank god for traction control. They are also way too much money and wear out too fast. They also dont ride brilliantly and are fairly noisy. Replaced with Falken ZE512s, which are rubbish on my Fiat Punto, but strangely very very good on the 7 series, however not great in the wet, but way better than P6000s, which really suck bad!