I was a Cytomax snob until I started doing very, very long rides, like brevets. Cytomax is fine. It's basically flavored maltodextrin with a few Magic Ingredients tossed in.
During my brevet days I was having to stay hydrated and energized for very long rides with no support, beyond whatever the local Quick Mart had. I went from being a Cytomax snob to putting almost anything from plain water, to Cytomax mix, diluted OJ, or diluted Coke into my bottles... whatever sounded good to my stomach under the conditions. They all worked. Absent the Cytomax Magic Ingredients, they are all just sugar calories. (Cytomax might argue that maltodextrin is very different from other sugars. Maybe so. To me it's just another step in the corn sugar process chain.)
So I agree with the posts about regulating your water, calories, and electrolytes (salt & potassium) as you need EACH of them. Cytomax mixes water and calories. That's a convenience. You might get 150-200 cals/bottle, but Cytomax is (was?) not a great source of electrolytes. You can get comparable numbers of calories from lots of drink or food sources. Of course, many Gu-type packs are just 100 cals/packet. Hardly worth the effort if you actually need hundreds calories to get you the next 20, 30, or 50 miles. So now I usually eat Real Food (often PB&J on whole grain bread - almost a nutritional match for many energy bars) and drink water, unless someone else is buying the flavored drink mix.