Had a little Green machine about 15 + years old. It finally broke last year and we needed a new one. I love this one. Having an older or younger dog makes this a necessity. I struggled with the need for a stain trapper, now I'm glad I got it. It keeps all the nasty stuff out of the main tank and tube. That's the one thing I did not like about the original Green Machine. We also have a full size, but didn't want to have to pull it out for a small mess.