If you spring for a new one there are obviously plenty of good options out there. Only one I have experience with as a now probably 8 year old Snap-On 1/2" impact. I don't use it very regular but when I do it always does the job. It even does what I had to borrow a 3/4" impact for in the past, the output shaft nut on a Roadranger with a 2-3/8" socket.
I think the newer versions are stronger yet.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-