My two year old has been now going potty for a few months but gets over excited if she's done a wee and if I don't get their quick she tips it out. She once took her potty to show her daddy and promptly tipped it down his arm.....he wasn't amused.
I found this potty on the Babyworld site and the brilliant thing about it is that wee flows through holes in the potty base into a lower chamber so it can't be spilled. It's then emptied by removing the seat section.
It's marketed as a travel potty as it also comes with a lid but I bought a Tommee Tippee travel potty for this purpose (it's less bulky).
This potty comes in sturdy plastic and in yellow with an orange lid or blue.
My daughter loves this potty but it may not be that good for a child attempting potty training for the first time as it doesn't look like a traditional potty and has no back rest. Also children like to see what they've done when they first start training.