First off, that is awesome! I have never seen so many absolutely bad "reviews" in one spot… I started reading them, but quickly saw that it wasn't reviews as much as folks proving that they either didn't know how to use their gear, never used it, or just expected it to be something it was not…
After reading through the comments on here about the Sawyer filters, I went over and checked them out… Let me begin by saying that I am not surprised that "Sawyer" came up on the list as much as it did. Simply because of the low price, and the fact that they can be found almost anywhere now, it's no wonder that most folks buy them… Now, combine that with the fact that most of these folks also don't understand the first thing about it, and it's no surprise that they are one of the most mentioned filters on this list (although, to be fair, there were plenty of other filters listed too…)
Anyway, it looks like there are at least as many folks (or more maybe) complaining about the bags and the connections than there are complaining about the actual Sawyer filters, and then, it is about both, the Squeeze and the Mini…
Now, I will admit, I am a bit biased towards my Sawyer Mini, and was so with my Squeeze until I swapped it in for the Mini. Saying that though, I do agree, for either model, it seems to be a hit or miss. I have hiked with others that have had both, a new Squeeze, and then another time, another friend with a new Mini, and the flow was less than desirable. Also, one of my other buddies Squeeze severely slowed down on him after using it for some time (although, after a good long soak in some warm water, the flow returned almost back to what it was when new). But thankfully, I have had nothing but good luck with both of mine.
As well, I should mention that pretty much all of my hikes with the Mini have been less than 5 days in length, with most being 3 days long, however, for all of these hikes, I never carried the syringe to backlash in the field, and never have needed it. I also haven't used a prefilter either though. All of the water was collected either directly in the Sawyer bag in a (somewhat) flowing stream, or by using a cut down Smartwater bottle to dip and pour (another solution to the many disgruntled hikers on the list…) Either way, I know that there was at least some sediment in the water, but never enough to cause me any worry. After returning from the hike, I then backlash with about 5 – 10 syringes full of clean water, and on occasion will backflush one last time with a syringe with a little bleach added… let that sit for about 30 minutes to an hour and then backlash a couple more times to remove any bleach residue.
So, I have been thrilled with my Sawyers, and will replace them with more should I ever need too, but I will be sure to always have a back up since any filter can fail…