I've been using Wilson Shock Shield. At first, it disturbed me a little that the thickness enlarged the grip by about half a size. However, it does seem to have shrunk down to something closer to a normal grip, and it's still very comfortable. TW sold them in sets of 3 for a very low price, and I'm glad I bought it. On the downside, every grip I bought had some blemishes along the sides that made it look sloppy. However, since I use an overgrip, this cosmetic flaw is not a big deal for me.
It does seem to improve comfort and shock in exchange for a slightly muted feel, but I have a Pro Kennex Kinetic frame. I think the Pure Drive will be more harsh no matter what grip you put on it, but if you have soft strings and a well cushioned grip, it might not be that bad.