No personal experience other than looking through a few of of my friends'. They really like them. Clear glass and etched reiticles is usually a winning combo.
I have a 3-9x Konus on my target AR, I really like it, one of my favorite scopes, price was a deciding factor for me in getting it, I was nervous at first, but its crystal clear, holds a zero very well and I'm able to group 3 rd groups at 200 yards with it in about the diameter of a quarter or smaller. I've shot close to 2000 rounds with it and the zero hasnt moved since I first zero'd it.
I have one of the M30 1-4x with a lighted reticle. I haven't used it yet but it seems to be a well made, and a bit heavy, scope. Tryin to decide what to put it on now.
I bought an 80mm Konus spotter. It is pretty good. It is not as clear of detail as my Kowa 661, and is not offered with a long eye relief eye piece. On the other side of the coin, the Konus was less than 1/3rd the price of the Kowa.