I got my son pull ups and asked him if he wanted to be like the big boys... after awhile they feel silly peeing in their diaper... kids always want to be bigger and better then everyone else... but i also like the above answer from gushlaw... i never did that but i can see what their talking about. oh and also make it very clear that he should always pick up and put down the seat when hes done... youll thank me later... I fell in once and that stopped ... good luck
Similar to Cherios you can use fruit loops with each color being worth more/less... Red fruit loop means TWO stickers!!! It's also regular practice for him to learn potty training sitting down. Actually makes a lot of sense given hand /eye coordination, which potty training aged chidren don't have yet!
With my son it was easy. His little potty sat out in the living room so he wouldn't have to walk down the hallway. After about 2weeks of him using it he started to feed the monster. (meaning pulling out the little cup and dumping it in the toilet and watching it flush) after about a month he was using the big boy seat.