I'm not sure about anyone else, but I've been constantly disappointed with some of their products considering they are supposed to be a decent enough brand.
I use the nxt generation tech wax and washing liquid. After I've cleaned and waxed it, the next wash there is absolutely no beading on the car, or very little. 2 washes later and no beading at all.
The waffle weave towel I bought was next to useless. It doesn't soak at all and I've boil washed it (no conditioner) several times to see if this helps. I've switched to cheaper microfibre towels and they work ten times better.
Using the glass cleaner last night was a pain, since the inside of the glass was cold the cleaner beaded up and smeared until I warmed the glass up with the heater.
The tyre dressing smells nice, but doesn't seem to last "weeks" as they put it. More like 7 days.
On the flip side, their older style lambswool mitt is good, and the clay kit works well. I've been pleased with those two.
Before you ask - I bought the valeting kit from them - I didn't keep buying the products!

As far as I can tell the Autoglym stuff is a lot better. The resin wax lasts longer, the glass cleaner and bumper dressing are superb, and I just got one of their applicator sponges which is worth its weight in gold.
I know both brands aren't top notch quality compared to other makes, but as far as high-street products go I'd buy Autoglym over Meguiars every time.