Cheap gels are minging, the likes of SIS sport etc. However Gu ones are really nice - salted caramel, chocolate outrage and salted watermelon are my personal favourites. The other brand I have used are Torq brand. They do caffeine and non caffeine ones, they even had a limited edition beer flavoured one at one point.
Caffeine:
- Banoffee pie
- Forest fruits
- Caramel latte
Non caffeine:
- Apple Crumble.
- Cherry Bakewell.
- Cherry Yoghurt.
- Lemon Drizzle.
- Orange & Bananna.
- Raspberry Ripple.
- Rhubarb & Custard.
- Strawberry Yoghurt.
They cost a bit more than the cheapo mingers but I don't mind paying it as I like the flavours