This is the current top-of-the range Ryobi Impact Wrench Range. It's targetted at people who want to do up wheel bolts as it has an auto-stop feature that stops doing the bolts up when the torque hits 120Nm. Clearly, you need to check that with a calibrated torque wrench afterwards, but it's pretty good in my experience.
It's not the Ryobi Impact Wrench with the biggest torque rating, but it is a great impact wrench.
According to CamelCamel this is the lowest price they have seen on this Impact Wrench.
Just be aware that there are new ones coming, rated at 450Nm or 1000Nm and both with the 120Nm auto-stop feature. So if you want to undo REALLY tight bolts and you want the auto-stop with a 1/2" drive, then maybe it would be best to wait for the one.