This thread is a little old, but I will throw in my two cents worth anyway. Over the years (about 40 now), we had a total of three vacuum cleaners. The first was a Kirby, a green one which had cloth bags (which CR said was overpriced and didn't do a good job). The only problem was that the bags would wear where they attached to the metal shoe at the bottom, and would then spew dust all over. We had it about 15 years, and only had problems the last two or three years.
The second was a Rainbow we got from a dealer who had bought a load, and was trying to get rid of them. We got it for $495 with all the attachments (again CR didn't like it, overpriced, spewed more back in the air than it picked up to start with). It has had the motor replaced twice, the power head motor replaced once, and numerous other repairs, but still runs and does a great job. I didn't like that it had a propensity to turn over once in a while, and since it uses water as its filter media, that's not good. But keep it clean and it does a real good job.
The third is a Sears model we've had about ten years. It was top rated by Consumer Reports at the time, but by the time the article was published, was in the process of being discontinued. We got one of the last models on sale at a good price. It has been a good vacuum cleaner, not as nice as either the Kirby or the Rainbow, but I have never liked it and it requires a lot of consumables. The next year Sears did not have a well rated vacuum cleaner.
My experience is that frequently by the time the CR report comes out, most of the top-rated items are no longer available. And many of the products they rate are difficult to find locally, like the Panasonic food processor which was top-rated in 1988 and I had to buy from the wholesaler in Atlanta because I could not get the retailer they referred me to, to even order it if I paid in advance. Of course it is no longer made and parts are very difficult to come by. So my experience with CR over the course of 45 years is a mixed bag at best. Can't complain about the Maytag washer which was top-rated in 1967 though - it lasted 27 years and always did a good job. My MIL went through 3 Sears models in the same amount of time!
Fred