I've used it before and I have some gripes with it. I used it to help me guage out some races before, but it's always been pretty lackluster in my opinion. Some traits are overcosted, others are very undercosted, it's fairly limited in scope (especially when you're getting into stranger abilities), and honestly some of the "monstrous" level races are... not really that powerful when gone over. Some of the other decisions I also definitely don't agree with such as a race needing to be in the monstrous point category for it to be able to get any level of quadruped or a few other traits. Obviously it's meant to be used as a guideline and not hard fact, but the guideline isn't much of one when three abilities that cost the same have wildly different power levels.