I have no experience with the Doctor, but I have 3 MOA FastFire IIIs on my S&W 25-2 and 624 revos, and I briefly had a 8 MOA FastFire III on my S&W Model 41 with Clark Custom STC barrel (for steel) until I replaced it with a C-More RTS. I think the IIIs are great for target shooting (compact, lightweight, and a good value) but I like the larger lens of the C-More for quick acquisition of the dot during competition. I have a 3.5 MOA Leupold Deltapoint on my S&W 625 revo, which is a fabulous sight, but much more expensive and much less convenient to zero. All in all, I think you would be happy with the FastFire III.
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