I never heard of it. I have some phonic readers but I am always looking for more. It was sometimes boring but it worked. After I did all the playing around and after I retired, I put my lesson plans together and self-published them. Grace - Gail, not really, but it's a spelling program that starts with very simple words and builds on them, constantly recycling.
Teachers do buy it to use with special ed.
Grace - Chia, yes. I do have my favorites. Grace - Gail, that's the name of the program. It includes spelling and language, therefore Spel-Lang. Grace - Gail, that's my program.