Well, at the risk of seeming adversarial (certainly not intentional) I will say that we have two side mounted scopes on 94's in the family, and are happy with them. The first was a Weaver k2.5 on my Grandfather's 25-35, about 1950 some odd when his vision started to deteriorate. He and his scabbard were gone before I was born, but he continued to carry it horseback until his death. We've recently brought it back out of the safe to compare to a new release 25-35, and it still shoots well, leaned to the side as the Gunsmith at Baldwins in Buffalo, WY put it on over 50 years ago. Another plus of the K2.5 is the fact the factory irons are still available for use. The second is a 1970's 94,rechambered to the 30-30 AI. We did two rifles, and opted to scope one in order to try to evaluate the accuracy of the chambering. Through the load development stage, a Weaver 3-9 was utilized, but it now has a J 4 scope (3/4" built for centerfires) This small scope leaves the factory irons available as well.
So pcking78, I will say that we are "actually using" the side mount scopes, and like them. If I know the shots are going to be 100 yards or under, I'll grab the Ackley with the receiver mounted peep. If things are likely to "stretch out" I'll grab the scoped one.
Respectfully, Gordon Taylor