I started out using Accelerade for rides, and Endurox R4 for recovery. While researching nutrition for the Furnace Creek 508 in 2007, I checked out Hammer Nutrition products, and liked what I heard from people who had used them, so bought some to try. On short rides I have used Heed, and on longer rides, Perpetuem. I did not see a real difference using Heed, so have settled on Perpetuem for all rides needing fuel. To me that is 35mi or more. I also use Recoverite after rides.
The only thing I was not too keen on was the mild flavor. After using the Accelerade, Perpetuem was almost bland tasting. I started mixing 2/3 Perpetuem with 1/3 Accelerade to punch up the flavor. Same with Recoverite--2/3 with 1/3 R4 for flavor. It makes it a LOT more appetizing to me.
I don't like to worry about spoilage, so carry a pre-mixed freezer ziplock bag in my hydration pack. One bottle for energy drink, and one for water (to mix another bottle, or refill my Camelbak, as required).