Sugar Glider University was originally formed for the sole purpose of bashing a certain diet and it's "creator". Now, I cant say I dont agree with a lot of things said on there regarding the diet - there wasnt really any information usable from there.
Unless they have changed that site drastically in the past few months, I would say NO - it is not a good reference source. A lot of the information is old and outdated. There were a couple of years where this site wasnt updated at all. The only part I like about that site is the article called "Boycott These Breeders". The mills they talk about have been around forever and things never change with them.