Extension tube is a great addition!
For me, the extension tube was a great addition.  I was using the go girl multiple times a day following hamstring surgery (couldn't sit for 6 weeks!), and it was a lifesaver!  The tube allowed me to direct the flow into a commode, and later a toilet.  I had no issues with it falling off, as someone had mentioned.  (I did cut the end of the go girl off to allow easier flow.). I highly recommend the tube for this type of use!
Rating: 5 stars