My experience is, these days, gutbuster is a frustrating army to play. Our effective builds are limited and we suffer from out of date warscrolls. They are great fun when matched against armies of similar "tier", however I struggle against more modern armies. My fat boys have been shelved for many months. Just my two bits!
I look forward to a battletome. I've very much missed painting ogor models. Very easy to paint, have great character, and the majority of the kits/bits are very interchangeable.