The servos I have listed in my Sig are 12g digital metal geared servos. They have almost the same specs as the ds410 align servo. My tail servo is the equivalent to the ds520.
The tail servo is an Align DS420. I have rebuilt parts of this heli. I use this heli to practice. I fly my Align 450 pro V2 otherwise when I am feeling more confident. I also practice with Phoenix flight simulator. For some reason I am in less pain when I crash the Storm (Trex Clone) than the thought of crashing the Trex. The Trex flight is awesome and way superior, smoother than the Storm. I have learned much about the sport between the a Helis. I have followed forum recommendations which are invaluable.
With Winter here.....I will dust off my Mcpx 2 and practice as well.
Man, don't go talking about flying the mcpx now lmao. I still need to get a new tail motor for mine.
Make sure to post up some flight video when you get these new servos in. I have never seen a storm that flies decent enough to upgrade like this. If you have one, I definitely want to see it.