Only bad experience I had was with Feline Pine.
It's a tubular kernel thing instead of grains of litter. Well, Snowy used it for a while, when he was tiny, and he being the very first cat I ever had to buy litter for, I thought we were fine. Then, he thought the futon was a better place to do his pee pee. So I changed off the feline Pine and virually had to re-train Snowy. He's still SO worth it.