The gel is thick and bright (I had the red color) and the blast radius is fairly impressive. It bounces up a few feet in the air, and violently spins clockwise like a firecracker. It has gone off reliably every time I've thrown it. In fact, if I'm far enough away from a target, I'm 100%% sure that it will go off on impact. The farther it travels, the more velocity it picks up, which all but guarantees detonation. The best thing about it is the "booby trap" option. There is a bunker where I play that always draws players to it, and I love setting a trap up in it. It's hilarious to watch a player run in, only to come out soaked and dejected moments later. It also works defensively, since I can trap my blind side and not worry about watching it.
At close ranges, you really need to throw it hard, which usually means you have to expose your arm and shoulder. I don't like sticking my arm out if someone's shooting at me from 15 feet away. Also, the mechanism that allows it to detonate so reliably also makes me paranoid that it'll go off in my pocket while I'm carrying it. It's never happened, but then again, I'm very cautious when I carry it.
The Meteor Shower is the closest thing to the old exploding grenades that I've found. It's reliable and effective. I wish it was about a dollar less expensive, but it's still worth it to me. It's the best grenade currently available.