I put in a new door on my garge this year, but I left it manual since I only park my bike in there. Anyway, it was one of the ones from Lowe's that can have a direct drive mounted to the spring. It looks like it would work well, but those direct drivers need a specific setup to operate on the door. Some older type of doors would not work with it. I installed it my self and it was actually quite easy. The spring has a little gear mechanism that you wind/adjust with a ratchet or drill and it's completely enclosed so its pretty safe.
