Funny enough most of the complains are technically not about using the product but that its extremely hard to implement, most of them complain they engaged with Redhat and Redhat support is still trying to implement the system đ, we do have to take in consideration most of these would be in big enterprises that have complicated environments though, personally I havent had good experience with RedHat things, I tend to always run into weird bugs that when going to look at the kb turn out because they backported their own thing into the linux kernel, I find Canonical tends to stay closer to upstream and is a bit more clean ( RedHat has the weight of IBM behind them though đ so they make more inroads into the enterprise )