In regards to two step vs uturn, if you're a keen mechanic and like to look after your kits and service your own forks, 2 step is great. But if not, they can be a bit unreliable. I've rebuilt three sets of two steps in the last couple of weeks, and whilst they feel great, there is that reliability issue. U-turn is very reliable however, and doesn't effect the spring rate like some travel adjustment mechanisms. The 2 step only come in about 60g lighter that uturn as well