i have the 7150 IR, cost me 300 shipped from the states. Best 300quid ive spent, absolute monster of a gun, really well built and the battery lasts ages. Cant recommend it enough.
DTW1001Z and DTW1001RTJ claim 1700Nm of torque
sure Makita do impact wrenches.
The warranty says it all. If you want tools that don't fail you have to spend the money. I have the 3/4" drive version of this, bought with 2 4ah batteries, case, free gun boot, free hat, drinks bottle ect ect over a year ago for £450 from m j plastics in Sittingbourne. And that was this most powerful version. Be aware of what you are buying when looking at these, many less powerful models on the market of the same 18v Milwaukee impact gun. Plus really is worth checking out your local stockiest for matched prices and freebies you wouldn't get buying on line.
Pro bit of kit. But the DIYer will vote this down, as they will see something in Aldi that looks the same for 30 quid, and drives those inch wood screws into plasterboard just fine.