We give these to the people in our various mygluco programs and most people really like and use them. I like the duct tape option but that's hardly styling
the hardest part about making things like this is tooling up for high volume manufacture. Anyone with a little passion can spend a few hours making one or a prototype but getting it into a production line so that you have a high quality run at low cost is hard. I'm not sure why everyone doesn't use these?