It's not quite cold-enough here yet for me to start using this controller, but I'm impressed with the product upon initial inspection and reading the manual. The manual is well-written in English and it is thorough - after reading it, I had no questions about how the device works or whether it could operate the way I liked. The manual also has great explanations of all the features and photos with descriptions to show all the displays and controls available. The controller has a great set of features to simply, but effectively, control the block heater without wasting a ton of electricity. You can set the controller to have you engine ready to go at a specific time, but it can also be set to maintain the readiness for 0-9 hours. So, if you want to be ready to go in the morning between 6am and 10am, this can easily do that. You can also set it to maintain the engine readiness around the clock or to just keep the block heater on continuously.