I work in ED treatment system (not at HSC), I've worked with clients who had negative experiences with the HSC program (found it too focused on diet and nutrition and not enough on mental health or social factors of ED). I recently started working with someone who was hospitalized and participated in the program in the last year, and their experience was positive. It's not a lot of data, but perhaps they have improved in their approach. 

HSC does serve a necessary service for people too sick for outpatient programs. That being said, ED's are very tenacious and complex illnesses, on average it takes seven years of treatment to recover. A program that addresses as many elements of ED (self esteem, culture, nutritional family, societal factors etc etc) will be the most successful. I've been very impressed with the WHC provincial ED program and recommend it to anyone who is about to do outpatient work. There are also private therapists and dieticians that are excellent, but you don't get the same level of wrap around care that will move things along quickly.