I agree with what others say about it's powder keeping properties and its extended tray life at working stregth. I investigated buying glycin not long ago and being in the UK found it impossible to source at a sensible price. An alterntive is Ilford Bromophen. It doesn't have the same tray keeping qualities but will produce lovely warmth to paper especially if you dilute it further than recommend and over expose your prints. Neither Ansco 130 or Bromophen will reach the dmax values that some of the modern developers designed for VC papers will. But that doesn't necessarily discount them though as a subtler contrast level may well be desirable for some work.