Pros:
Several things including: 24 hour responsiveness for repairs, doorman and concierge service (lots of packages and a mostly safe system to distribute them), very clean lobby, business center, media room and play room, regular email notices about package deliveries and staff updates ie: the superintendent will be on vacation or no smoking reminders for people with terraces, garbage is collected a couple of times a day. There's a well maintained gym and pool. Intercom system works. Doorman will hold elevator for you if you're carrying lots of packages.
Cons:
They rarely clean the outside windows. We've lived here for over 10 years. I think they've cleaned the outside windows twice. If you want to move to a new apartment in the building, you have to re-apply. There's two elevator banks: One you have to pass by the front desk to get clearance to enter. The other isn't as secure; it's right after the front entrance, so people can just walk straight to the elevator without checking in with the front desk first.
Advice to owner:
Bring the rental prices down! Of course!!!