It can save a long exhausting swim if the wind dies off, or even worse-an injury to an ankle or knee during a session doesnt necesarily leave you flailing around in need of a rescue. Maybe a good tool when u first start out, but to become dependant on it is like kiting before learning how to swim.
Case in point, when I tore my hamstring this weekend, the only way for me to get in was bodydragging. Go Joes are fine but.......good tips on the bodydragging
When the Go Joe came out, I think we called them "kook flags". I think it unanimous that it's a much better gadget than a reel leash (yes I had one 8 years ago for a couple of sessions!)
I think it's a gadget/crutch you need to learn to ditch, sell it to the next beginner and not look back. Besides, if you are going to want to experiment with a directional, you need to have already gotten comfortable without one. Have we seen directional rider with a Go Joe? That would be funny!