About six months ago, I replaced a cheapie 1/2" impact with an
IR-231. What a difference in both price and performance! My
decision was between the 2131 (plastic housing - 600 ft-lbs torque)
and the 231 (metal housing - 425 ft-lbs torque). I was a little unsure
about the lower torque of the 231, but a number of shops that I
talked to were leery about the long term durability of the 2131 and
I decided to be conservative.
Luckily, Harbor Freight had it on sale for $109 when I needed it
and I jumped on that deal. My friend who offered to get one at
his cost through his shop could only get down to $129, so HF got
the order. I went to a local tool distributor and bought a plastic
protection sleeve for the body of the tool to minimize shop damage.
So far, I am a _very_ satisfied customer.