This is a nice tool. There is a bit of a learning curve, but if you do a lot of siding that's not a big deal. Occasionally you'll want to check the level of your courses - not because of an error with the tool - but because specs on the fiber cement is not perfect. Super Saver shipping went out US postal service (after over 1 week, it still hadn't shipped). Ordered again with shipping via UPS and it arrived in two days.