I forgot to mention something....when you are using the Heli Test Stand or the Gyro Test Stand....please...for your own safety...DO NOT GO FULL THROTTLE/FULL COLLECTIVE PITCH!!! These two tools are for "testing" and working out various problems. Not for fun and games! If you do go full throttle and full collective pitch, you are very likely to rip the landing skids right off your heli. Maybe not on the Blade 400 or Trex 450 or smaller...but on a 500, 550, 600, 700, and bigger....DO NOT DO IT!!
If you do decide to be stupid and go full throttle and full collective and your landing skids get ripped off your heli.....I am definitely not responsible for the hole that will appear in your ceiling (if done indoors). I am not responsible for the trashed heli, nor any personal injury.
That all being said...I like my Heli Test Stand. it's great for learning how to get into a controlled hover. I like my Gyro Test Stand. it's great for being able to keep the heli in one place while I am making adjustments.
Have fun and for everyone's sake....be safe!