I make mine with 2% milk. Of course whole milk is tastier. Tried it with fat free milk and it didn't really come out well. Haven't tried 1%...don't know why. Make sure the milk is regular milk and not ultra-pasteurized...it will never work.
One of the reviews suggests using buttermilk. I've been meaning to try that but haven't yet.
ETA: It took me several tries before it came out how I like. My biggest mistake was not heating the milk enough (the drained whey should be yellowish not white-ish). What I eventually also learned is that if it doesn't curdle/set up enough when draining you can dump the whole thing back into the pot & try again.
The cheese can also be pressed if you want a more solid cheese. It's tasty both ways.