After having used a fair number of drink mixes in the past 10 or so years, I didn't think I'd find anything much different. I am glad to say I was wrong.
Taste - big difference between Fluid and competitors. It's lighter, easier to drink flavors that don't get so cloyingly sweet. Makes me more willing to drink towards the end of long, hot rides.
And the flavors? Not the same as everyone else. A little different, which I enjoy immensley. Who else has Passion Fruit Tea? It's my favorite, btw.
Fluid recovery works great, too. Just what I need at the end of a session of intervals or race. Keeps my muscles happy, which in turn makes me happy.
Best of all - all natural ingredients. Important factor to me.