I've dabbled in a good few of the ranges from Q and IW and as far as moisturisers and eye creams go these are pretty good. They maybe tend to be a bit heavier than some so I tend to buy for winter from this range. I've had the biocollasis and collagen ranges; never had any irritation, tend to be scent free, very soothing for my dry skin, never get break outs with it either. As to results, I've never EVER had a reversal of the signs of aging with any range, high or low end and the best I ever expect is not to see a rapid degeneration!. Have to say I'm not so keen on the serums but do use if in a collection I thin is worth buying; maybe relegate it's use to neck and dec area if I'm not so sure.
More as far as the price range goes I'd rate it above Prai (which I actively dislike) and similar to Judith Williams. I would go for serums like the hyaluronic from JW but don't don't rate any of her actual moisturisers which are all highly perfumed.
Oh and I would say all the reps of these products are using fillers or some other help including JW ( her top lip is a give away) so I'm not buying into the hype they all peddle.