I've used these for a few months now and am overall happy with them.
'was looking for something "light" enough that I would use it always, but would offer reasonable protection when needed.
'previously tried Fox Launch Pro Knee Pads but we didn't get on - back of the knee rubbing - and I ended up not using them.
Pros:
1. comfy; you don't feel like you're wearing knee pads - you don't get too heated (but haven't had a very hot day to try them) - they don't slip or wander around your knee
2. a good compromise solution if you do a mix of XC/uphill and downhill in one session e.g. 3rock or leadmines
3. more impact protection than other "light" cycling pads - e.g. SixSixOne Rhythm Soft Shell
4. they wash well i.e. can just throw them in the washing machine with the rest of the cycling gear
Cons:
1. they cover the knee only i.e. not shin - if you use the g-form shin pads they don't fit very well together with the knee pads
2. they're not bike-specific - so recommendation seems to be to buy a size up i.e. I measured as XL but bought the 2XL - but try them on if you can first (though as with any other knee pads you/they need to be broken in)
3. relatively expensive if not on sale; they were available for half price during a sale at
http://www.g-formuk.com/products/knee-pads.html
4. can't put them on with shoes on - not a major issue given they are light I put them on at the beginning of a ride