I have been using this for about 6 months. It is Glycin based and it seems to adhere to the photoformulary description pretty close. It is contrastier when strong and softer when weak. It has about an 8 hour tray life and about 20 8x10s per liter. I use it only for fiber and an now using it as a 2 bath. (Thanks Les) one bath at about 1:1:3 and another bath at 1:1:8. Read Les's article. This produces the best results for me so far.