My gym has a horizontal leg press machine, where you lie flat on your back and push the weight straight up. I read somewhere that this machine is bad for heavy leg presses, as you cannot breathe correctly, and that it could lead to a stroke. Well almost no one uses it for leg presses, but I love to do it for calf raises. I like them better than any other calf exercise there is.
I use a four day split, but do my calves twice, and I go 2 on, 1 off. The first calf workout I do 5 sets of raises on the horizontal leg press, then 5 sets of seated raises. The next calf workout, I'll do 5 sets of standing calf raises on the machine, and 5 sets of the donkey calf machine.