I have used these for years. My better half uses them when she runs too. We both tried the newer thinner gels that are getting popular right now and both came to the same conclusion. The others work okay but you crash hard with them so you better be ready to keep pumping them in once you start. The Hammer Gel's have no sugar so we don't seam to crash after taking one. It will just get used up and you can take another or just ride on in tired. When the other thin ones we tried gets used up you better take another one or it isn't going to be fun getting home. If I am 8-10 miles from home I hate to burn a Gel just to get home on a solo ride, with Hammer I don't have to.
I have used High5 tablets for a couple years and have liked them but the price keeps going up and I have to order from the UK. I have also used Hammer Gel's and Heed for a long time and thought I would try Fizz. I think they are better than High5 just a little more expensive.