I would say that SGH can still be considered the best economics university in Poland, however it defenitelly relies on the good reputation earned in 90′ and early 2000′.
Studying at SGH for sheer theoretical knowledge can be done, but it requires carefully selecting your tutors and being more ambitious that the curriculum requires you to. The thing that adds value to studying at SGH is defenitely the number of student organizations and clubs, and practical benefits that come from participating in extracurricular activities.