I'm doing the Hogweed Hilly Half in a couple of weeks, so I've been experimenting with the sweets and SIS gel sachets. The sweets I like. The gel, I feel, is natures way of getting back at me for making my kids try new food!
I'm not sure either do that much for me to be honest, I'm only running for 90-120 minutes and if I have a great run that may be down to an extra hour in bed or the banana in my porridge.
To answer your question though, I wont buy any more gel when it's gone, but I will get more sweets!