I recently started using a squat toilet. Never has number two gone so well. Apparently it's the position we're best designed for. Provides a great hip flexor stretch too.

I use a lillipad: http://www.lillipad.co.nz/

It converts any normal toilet into an optional squat toilet. I don't think it would work with these warm-water jet toilets though.

If you have any issues with your bowel movements (constipation, diarrhea, both), you owe it to yourself to try a squat toilet.