Pros: two simple pieces, hard plastic construction
Cons: some dripping off the seat when emptied
We started training with this potty. It is a great height, sturdy construction, and two pieces that fit snugly together. Plus there is a little 'seat back' that gives some support for those longer sessions. It is relatively easy to clean, just dump contents into the toilet. There can be some dripping over the back lip which will also get on the base if you don't wipe it off or let it air dry.
The seat is probably geared for younger and thinner users. Since there is a seat back that is curved, the amount of bottom that can fit on it is limited. We are still using it at 3 years but my son is in the lower growth percentiles.