I am finally looking forward to designing a new WC system using one or both of the blocks I purchased from Cathar. I actually have 1 each of the G4 and G5 and they have only been taken out of the boxes for photos (long story, lets not go there). I would be very interested in also finding out the status of this pump, vaporware or worth waiting for? I have set aside a significant budget for this system and obviously waiting is not much of an issue for me.