impressive bit of kit, only problem is it comes in various sizes
You are correct! I ordered their newest model called Nutty Buddy flex, medium size since I am a 5'9'' and 145 lb guy. It was too small for me and I had to return it for a replacement. I should get the replaced cup after Christmas. I will review it once I have it. One thing was clear for me that the sizes run smaller than what they have specified for sizes.