In my opinion 400 is more than fair I do not normally stand behind a tool as aggressive as this impact. I scrapped out two junk cars on Monday with my 8810. Before we scrap them we have to pull at least the fuel tank and tires. One was an old Nissan with half a dozen 10mm bolts (17mm head) holding the tank in. This impact with a universal socket tore those RUSTED bolts out with ease. I don't know of another 3/8 impact that could have done that. The tires were 13/16 lug nut I didn't have to heat or cut a single lug nut it ripped those nuts of with just a moment of hammering.
seems legit, but the Milwaukee m18 3/8 impact wrench kit runs under $300 with 2batteries and charger
Hopefully they release some info on there site soon.