OK so I finally plunged on the bosch 3/8 with the $40 off of 200 purchase and the 2 additional slim packs via mail from Bosch I figured now was the time to treat myself to something I have been wanting for a while.
so IWH181-01 came in the mail, first thing on AMazon they just copy and paste the specs from the 1/2 inch and make you think it has 500 ft/lbs which I know it didn't I figured real world would be 125-200 and it should be a monster for the size. being me, I popped open the package, held the gun, felt like expected didn't really blow me away. put the fat pack on the 30 min charger while I was doing other things I needed to do. came back when it was charged, and well duh, I had to try it out on something. pulled the trigger and it really didn't seem like it was a screamer, but oh well real world will tell

put a MAC 19mm deep well 3/8 impact socket on it, walked over to the wife's 2010 Civic and proceeded to remove a lug nut, hammered for a couple seconds and then spun it off. so I tighten that one back on and go to remove another one, it just hammers for like 10 seconds and it is pretty loud and will not remove the 2nd lug nut. hmmm. ok, well I know I put the wheels on at my shop and I don't remember if I used a TQ sticker or just hammered them on or what. so I pulled out my dewalt DC823 put a LI-Ion dc9181 (non XRP) battery on that I had laying around on my sawzall, so not even a fresh charged one and put the socket on it, and tried to take the lug nut off and it spun right off. put that one back on, tightened the other one more, and tried the bosch on a couple different ones, some it struggled and took off after hammering on, but the Dewalt took any of them pretty much right off and tightened them more.
my initial dewalt review (i unscientifically tested it to be around 80 ft/lbs i figured) maybe is more like the real 125+ they claim, was clouded by wanting the bosch so badly and thinking it was going to be so damned good. well IMO the Dewalt is better. for some reason the dc823 only comes bare or with the old batteries. I see there is also a 20volt 3/8 cordless that would be nice to try but I just saw the brushless tools starting to be listed on the site as well.
so unless you have bosch batteries and a full selection of bosch tools already and can buy the bare tool just to have it, get the dewalt because I find most people that have had cordless tools for any time period have some dewalt batteries.
is there a king of 3/8 impacts hiding somewhere? Snap on, Matco, Milwaukee? cost too much money to try them all. what is the best way to test them? torque a lug nut to 140 and see if we can get them off? hammer a lug nut on and see what it reads on a torque wrench?
sorry this was long winded and probably run on with poor punctuation, but I am not a pro reviewer just a working man trying to get some good tools with hard earned $