Had one of these for years, was always a car I wanted to own when they came out so I bought one as soon as I could.
I would agree with the comments about handling, its a heavy car, the brakes are definitely the worst thing about them, far too small. Its also important to remember that these (as with any old car) are dated vehicles (practically 20yrs old), you simply cannot expect to compare them to most things from the more modern generation. A brand new E39 would spank an E39 these days simply because it had new brakes, steering, suspension, vs some 15 yr old car that has been spanked everyday and now handles like a mattress.
Its a fun fast car, 5L 6 speed manual for about 8k for a half decent one. I personally always hated the E60, but again that's also tremendous value for money.