Re: IOR Rundown
IOR's glass is great for the money; if the scope works as advertised, it is a great deal.
I've owned the SH3-18, a 4-14 and now have a 2.5-10 (the new one) and really liked them all for the price.
The old illumination systems were far too bright, that has been fixed on the new ones. The glass is always a pleasant surprise, and the mechanicals work well (unless they break - which sucks when it happens.)
So long as you buy something they've been making for awhile, you should be fine. From my simple observation, it seems thoe scopes on 30mm tubes have less troubles than those on the larger tubes - maybe it is anecdotal.
I have the new 2.5-10 FFP on my 300 Whisper and have been very, very pleased. It ain't as pretty as my Hensoldt, but it gets the job done.
If you buy, I'd only buy from SWFA or Scott at Liberty Optics, there "might" be a problem and both operations will take care of you. Nothing against other sells, but both have always done right by me - even when IOR did not.