Just picked up the Ca/Alk/Mg Foundation kit along with the Nitrate 2 weeks ago and I really like them. I am getting similar readings to my Salifert kits with CA/Alk/Mg. They do require more water for each test, but I really like the Titrator with the Foundation kit. Make dosing and swirling a lot easier, plus it just looks cool to me.
The one problem I found is that the paper manual has different instructions for the Alk than the result card instructions. My LFS said that Red Sea was fixing that and to go by the result card instructions.