Product review (5 stars): Great for travel and emergencies
I recently purchased this to take on a vacation for my almost 3 year old son.  It worked great.  I bought some of the plastic liners, which were really great for keeping the potty clean and quick disposal.  I was able to fit it in my backpack and it was really useful for the airplane, since I knew there was no way he'd be willing to use the toilets in the airplane.  It was (and is) great for keeping in the car in case of an emergency.  It's very simple to use.  It just winds up and down so you can make it taller or shorter depending on what is comfortable for your child.