Hogue makes them in two varieties, one with pillar bedding (which is the type used on Hawkeyes and SPS Tacticals) and another with a full-length aluminum block. They look identical, and they all have a wonderful "feel" to them, very comfortable to hold. I like the ergonomics of them a lot. I've had and sold several of the pillar-bedded type, not because of any particular problems, just normal horse-trading. They aren't the stiffest stocks in the world, but I think they are well worth the money.
I still have one of the aluminum-bedding-block versions, mounted on an older Ruger MkII model 77. It is very stiff and stable, definitely an improvement over the original synthetic on the gun. It is NOT lightweight. I haven't weighed it but it's considerably heavier than the original stock, and also than the pillar-bedded Hogues.
Overall I like these stocks and would recommend them.