I liked the concept of how this seat worked, except it didn't fit our toilet very well. The main toilet seat didn't sit flat with this one underneath, so there was a risk that when my daughter sat on it, it would pinch her skin. I didn't want to risk her hurting herself when we're just starting toilet training. I recommend doing what I did. Keep your receipt, and check if it will fit your toilet properly before taking the packaging off. That way you can take it back for a refund if it doesn't fit.
Easy to clean, simple yet effective design.
Didn't fit our toilet seat very well.

Even though this was outgrown quickly it still proved to be a more successful option than the potty we purchased from the same manufacturer. It made our son feel safe sitting on the toilet seat until he got a bit bigger and din't ned it anymore.
We found this to be a useful aid in starting to toilet train our first son. It made him feel like a bog boy sitting on the same toilet as everyone else. Inexpensive and simple.
He outgrew it really quickly. The 'splashguard' tended to push on his private parts and we found it was easier to just support him a little while he sat on the regular toilet seat.