I didn't see the equipment requirements when I looked at GUE -- I need to spend a little more time on their web page. Can you give me the basic idea of the required equipment?
Equipment Configuration | Global Underwater Explorers
It's a good setup. Was designed for caves. But works nicely in open water as well. It's not optimal for anything - but it's part of a system that allows you to do challenging dives as a team really well.
It's not just the equipment though - it's how you use it. It's also very expensive and a bit overkill if you are just wanting to do some relaxed recreational diving.