Just been lucky and picked up a second hand (as new) 8-32x56 S111 LRTD/TDT.
This appears to be very popular with my lot (F Class club) and I got this to go onto a fairly standard .308, it will later go onto a dedicated F/TR rifle.
I have not actually got out and used it yet, other than picking the rivets out on a pylon 3/4 of a mile away...ruddy hell!!
Yes, there is some colour edge fringeing, but this will be used exclusively for target shooting, and having used one on the range I was very inpressed.
A quick word with John from AIM confirms that the lifetime warranty still stands, so happy days.
I have been using an MTC Viper that has served me extremely well, and will be a keeper...particularly as it was sent back to me as being U/S..but against the tiny targets used in F Class you need the greater mag and fine target dot ret to be competitive.
I am told you can see bullet holes at 600....I will let you know.
The bottom line seems to be that for many (including Russel Simmonds, world F/TR champion) Sigtron SIII series scopes are up there with the big numbers, and this model in particular.