Well I have a couple different kinds of robo's in my shed. I have one Mojo, a couple baby mojo's and a "baby" lucky duck (cheap one they make).
I've had good luck with all of them other then burning up a motor in a baby when the motor got turned on inside a bag. A good tip is to always disconnect the battery so you dont have to worry about it when hauling them out.
This year is the 1st year I have the magentic wings on all the mojo's and those are the ticket. Quicker set up and no worries about cold hands and losing the darn bolts. Priced alittle high at $20 a pair but worth it in my mind.