I have found that the only people who actually care about this stuff take surprisingly few pictures... if you know what I mean.
Good point. I was always amused by the techno-talk surrounding audio equipment, and always felt that unless I was just trying to stroke my ego, I should not pay good money for any features on any equipment if I could not discern the advantage via my own senses.
If concern for IS is holding back your purchase of equipment and your picture taking, I say, pick one or the other system and get going.
As for reviews, about the only sort of review that would matter to me would be a test where the two systems are compared against each other and against a system without IS in shooting subject matter where stabilization, if effective, should make a difference.
I think that would be simple enough.
Concerning comments that tripods are cheaper and more effective, that's probably true, but, only if you have a tripod with you, and only if you have time (and the situation allows you) to set one up.
There are venues where tripods are not allowed, and many situations where they aren't practical.
In low light situations, a flash is, perhaps, the best stabilizer of all. Unfortunately, it sometimes changes the shot in ways that are not desirable, or the scene is too fast for it to be effective, or flash photography is not permitted.
. . . and, again, if you want to call upon it, you have to have it with you.
Large format film cameras give an advantage in sharpness due to their larger image recording area. But they are inconvenient and heavy to carry around.
Personally, I am impressed with my IS, glad that my camera has it, appreciative of the fact that it works with any lens that will fit my camera body. There are situations when I want to shoot landscapes at dusk where I would have given up on my film camera unless I had a tripod. My A100 allows me to still get an acceptably crisp hand-held shot.
So, I like it.
Happy shooting.
Caruso