I brought these trousers after reading the reviews on the site and have come to the conclusion that a majority of the 5 star reviews are people who use these trousers in light/moderate rain whilst walking. I used these for cycling to work and got a wet backside every time, they keep the rest of me fairly dry as the rain trickles off the trouser but anywhere that has constant contact with water for example on my saddle will eventually leak through.
Today I wear these with someMuddyfox Padded Cycling Tights Mens
which kept my backside dryer than wearing the waterproof trousers with a pair of jeans or tracksuit bottoms, the padding on tights seem to absorb some of the water.
These are cheap so I guess I should not of expected much but with a name like Regatta attached to it and multiple 5 star reviews I am a little suprised. I will not bother returning them as they to an OK job but if you are looking for something completely waterproof I think you are better off paying for something higher quality.