I prefer GU energy, along with a water bottle. This combo allows me to adjust/respond to my energy level needs without having to commit to a full water bottle consumed. If I need more fluids I can adjust that too, without impacting my energy intake.
And GU makes it easy to dose, every 30 to 45 minutes on longer rides. Flavors are great, get them in single servings or in 15 serving pouches (more affordable), and load it into flask.
This large bag size is great for filling a gu flask or an 8 ounce hydropak flask with the gu cap on it for longer rides. Tastes good and keeps the energy up. It is nice to not have a bunch of gel wrappers in your pockets after a ride.
I'm a fan of GU for providing me everything I need from 2 hour rides to 8 hours. I get these bulk packs and squeeze 4 oz in to a Hammer 6 oz flask, add 2 oz of water, and shake. This gives me a much easier, less messy way to consume on the go. Best value, particularly when these are on sale.
Like the taste, used this on a Gran Fondo and it worked. While I used the refuel stops to fill water bottles I didn't need to get food. Spent less time at the restrefuel stops more time on bike, finished faster.
Stuff works, 'nuff said...but...
At $1serving (the regular price), I don't find particular value in buying bulk. A GU competitor sells their bulk bottles at $0.77serving. The premium GU Roctane is $1.66serving. That MSRP is too steep for me.
Love the taste and very easy on my stomach. I have seen numerous comments about the flask and related on-bike storage but do not see 6 individual packets that each leak and make a royal mess after opening as being a better system. I do not want 6 opened, sticky packets in my jersey pockets. The problem is that gel is inherently messy and incredibly sticky - you cannot 100% empty it from any container. Personally, I would rather have a single large flask than repeatedly tear off the little opening tabs at risk of squeezing while doing that and covering myself with gel. And it is just not that hard to put a flask in a pot of hot water to clean it.