I usually always race with Powerbar Perform. It is what is on the course and for the sake of ease, I use it. I don't love it, but I do better with it than I did with Gatorade, so I can't complain too much.
I do love Skratch Labs though. I fell in love with it several years ago when it came to the market originally as "Secret Drink Mix." The history of the drink is interesting. The cyclists in the Tour de France were all getting"gut rot" from their sport drink sponsors. Sports Physiologist, Allen Lim, created an all natural, high electrolyte sports drink with lower carbohydrate percentage for optimal absorption. End result, Gut Rot problem solved.
After Ironman Mont Tremblant, I had a call with Jon from Skratch who had raced with it during an Ironman to discuss the feasibility of doing it. When I calculated my adjusted fluid intake for Kona and realized I would need to be taking in 4 bottles an hour, I decided my gut was going to be much happier with Skratch than with Perform.
Jon sent me the new Skratch Hyper that hasn't hit the market to try out as well. I tried it out while training and loved it.
I had a bottle of concentrated Skratch on my bike and in my aero bottle and on the hydration tail, I had regular bottles of Skratch to get me through to the first aid station.
For the concentrated bottle, I had a 24 oz bottle and filled it with enough scoops for 12 bottles. And filled the rest with water. I then took a sharpie and made 2 oz marks up the bottle. At each aid station I would take a bottle of water, fill my aero bottle and squeeze 2 oz of the concentrated Skratch.
As I was riding through the lava fields, I was so happy I had decided to hydrate with Skratch. It went down much easier and I was able to hit my hydration target, which I don't think I would have been able to accomplish without some sort of gut rot.