The only thing i can suggest is to make sure the potty has 4 legs on it. The first potty i got had a flat bace and it tipped over every time my then two year old would sit on it!
We ended up with the one that sings when they go potty. I turned off the singing part becasue the first tiem she pee-ed in it it the song scared her so bad that she refused to sit on the thing for a month! The potty itself is a good one though. 4 sturdy legs and it's easy to empty and clean. It also had a removable splash guard. My 23 month old is going fairly regularly in it now.
BUT i do have to warn you that from what i have heard if they train before or during their 2's they can regress and stop using the potty very easily and often.
I have actually found that it is easier when the kids are in diapers. Then i don't have to visit every single toilet in every single store i drag them to! (i have three kids under three! things get tight!)