I purchased these pants a couple of months ago and have used them on two rides thus far -- the first was a one-day ride in the scenic areas around Las Vegas in January, and the second was the two-day off-road course at the BMW Performance Center in South Carolina in February.
I did not encounter any significant precipitation on either ride, so I don't know how well the rain-proofing is, but given the construction and performance I have experienced, I have every confidence that it will work flawlessly.
PLEASE NOTE: That the pants do run small -- although the companion Pursang jacket seems to run true. I am 6'2" and right at 200 lbs. The XL was far too small, so I had to return them (which was hassle-free) and get the XXL. With the XXL, I can tighten them a little at the waist with the adjustment straps and they fit perfectly.
So far, I have not ridden with either of the liners in. That is, I have just used the shell and been perfectly comfortable down to 41 degrees and cloudy/high humidity. I suspect with the linings you could ride to the Arctic if you were so inclined.
I only gave a 3 on the "protection" because I am not 100% confident in the placement of the knee protection and the hip protection is pretty thin. Although, I will say that they provide great protection against thorns, etc. and I did come off the bike about 15 times at the BMW course, and the only injury suffered was to my chest, so they at least protected me well enough there to prevent injury.
For the cost, I don't think you can beat these pants. I have taken them apart a couple of times and the zippers and snaps all seem to work well.
I am very happy with the purchase and highly recommend them.