I just recieved an email from anthony Simmons at Spa Photo, about Cromatec filters. They are made from cr39 optical resin, same as Lee and cokin.They will fit the Lee holder, and do make some that fit the Cokin P holder. The polarizers and star filters will not fit the Lee, and they make some optical class softeners like the Zeiss Softar. I contacted the compant earlier this morning, and had a reply in less than one hour,I like the swiftness of response, and they will be posting some literature to my home.
Hope that answeres your question about them.
Rick