I drove an E50 (the earlier model with the VG30 in it) a few weeks back. Isn't too bad for the age of the car, goes pretty well and didn't struggle with 6 people in it. It sounds kinda busy on uphill stretches at freeway speeds, but if you look down at the tacho it's only pulling about 3,800rpm at roughly 100-110km/h in 3rd gear.
Obviously the centre of gravity is higher, and that took some getting used to, and (also obviously) trying to drive around potholes doesn't really happen. The one I drove had "adjustable" suspension, but in auto mode it was very floaty, and in sport mode it was a bit harsh over bumps - which, like I mentioned, are hard to steer around to avoid.
The main issue I had with it, though, was the total lack of feeling in the steering. It's way too light and feels like it tends to wander a bit - this might be helped with a wheel alignment and some extra caster, but who knows...
It had plenty of gadgets though, so seemed pretty good value.
Oh, one other thing: my left leg was sore after about 45mins of driving, and I was on the road for just over 4hrs total that day (home near Parramatta to airport, then airport to Central Coast, then back home again via airport). Between gear changes, I'm used to being able to rest my left leg on the centre console of the Stagea, so maybe the fact that I was driving an auto and didn't have anything proper to rest my leg against (especially for the amount of time I was on the road).