Wayne Dalton i-drive opener
The I-Drive opener from Wayne Dalton has become highly popular with home owner for several reasons. Its Design allows the motor to be mounted on the shaft of the springs system of the garage door this is a great innovation from Wayne Dalton because it allows the motor to be kept out of the way unlike traditional garage door openers which require and take up a lot of the usable space in a garage. The I-drive is also great for applications were there isn't enough room for a standard garage door opener to be mounted because of a low ceiling. The i-drive garage door opener isn't an opener that should be installed by do it your selfers and even those professional who aren't properly trained in installing this opener will find installing it to be incredibly challenging.
The I-Drive is available for torsion as illustrated in the photo below. 
Torsion I-Drives seem to work best with doors that are 7ft high and not so well on door that are 8ft high. This is based on a survey of garage door professionals.
The Torque Master I-Drive is shown in the photo below and works on both 7ft and 8ft Wayne Dalton garage doors with the torque master spring system. See a list of the features below the Photo. 
i-drive Features
Find Qualified Companies to Install this Garage Door Opener Below
Alamo City Overhead Phone 210 336- 0081
Hollywood Crawford Door Co 210 494-3434