Mine's not trained yet, 29 mos. and in cloth from birth. I EC'd with her for about 6 mos. but when she started walking she didn't want to stay still long enough to use the potty, so that was that.
I personally feel it has more to do with maturity and understanding than what kind of diaper is used. When the child reaches the point where they can fully understand how the body works, can have some control over it, and *want* to imitate adults using the toilet, then it will happen. I have learned with my own child that the more I try to encourage her to use the potty she fights hard not to. Even if I try to make it positive, she feels the pressure and resists. My dd can pee in her potty at will, asks for a diaper to pee/poop in if she's diaperless at the time and can hold it until I put one on her (or will go in the corner if I don't), and is starting to tell me when she wants to be changed. But for her, she just doesn't feel ready yet.
I've talked to people who have used both cloth and sposies and at least with those people they say it hasn't made much difference, they learn when they are ready. My dd hates sposies though. I put her in them sometimes if we get a free one in the mail or are on a vacation that's not cloth friendly and she always wants them off. I think they are too hot for her, and also get lumpy and heavy when wet. Cloth is wet feeling, but still breathable and certainly not lumpy and heavy.
Anyway, from friends and family:
Friend's son, trained at age 4 with sposies
Friend's daughter, trained at age 3.5 with sposies/cloth combo
Me, trained at age 3.5 with cloth
Dh, trained at 18 mos. with cloth
SIL, trained at 3.5 with cloth
Half sister, trained at age 3.5 with sposies
Cousin, trained at age 3.5 with sposies
So there you go.
7yo: "Mom,I know which man is on a quarter and which on is on a nickel. They both have ponytails, but one man has a collar and the other man is naked. The naked man was our first president."