Yep, my previous review stating I had problems with these blades....now it's all good and sweet. It was just some adjustments I had to do for my heli. These blades are absolutely a great upgrade choice for your Lama v3/v4 ---- And just FYI you DO NOT need any upgrades to go with the Xtreme blades, but I think it will help the precision in the X blades' rotation if you had the Metal Blade grip upgrades or the Xtreme blade grips upgrades - just a thought~ oh and very durable -- still don't abuse it, they are unbreakable afterall :) have fun and enjoy~