I have had mine for about 7 years. Its very good and I highly recommend it. Looking at their "latest" guide, the only difference I see is the added length. Mine has all the other features they tout.
Mine is very accurate and durable, having survived several unscheduled and uncontrolled descents to the concrete floor in my garage without losing any accuracy. The diagonal arm supports long pieces very well also. I give mine 5 stars with no hesitation.
Go