Point taken. I was Christmas shopping on-line for a vacuum cleaner for my son yesterday. I agonized over the bad reviews on Amazon.com for that just about every vacuum cleaner sold. Even the Miele vacuum cleaner I was looking at couldn't get over 4 or 4.5 stars because of a lot of one-star reviews, and Miele puts out an excellent product. Anyway, I eventually came to the very conclusion you mention, that some of the reviews were likely hit jobs. And others were just unfortunate situations and unhappy people perhaps. So I had to just ignore those reviews and bought my son a Eureka Mighty Might, and I am sure he'll be quite happy with it.
Having said that, you bring up an interesting question. From the doctors on this board, and any others that might know, such as Berryfit, how many patients of yours have had a reason to drop V?