I've stayed there last weekend. The hotel needs some renovation, and fast, as it's showing it's age. Concierge - upgraded to suite on the 7th floor (which is much more worn off then the 6th floor in the past).
I've also visited the new Red (it wasn't opened yet) - we were welcome by the Red product manager who let us see the hotel and the room - generally it's a mixture of Radisson Blu (service wise - full service hotel with room service and such) and Park Inn (fresh, vibrant, modern arrangements, furniture, lot's of electronics - for example you can stream from your phone/laptop directly to the TV in your room). Breakfast would be served a'la cart, not as a buffet. The staff at the Red is very energetic, engaging, lively. I'm looking forward to my next visit to Brussels to test it out ;-)