Was? It still exists! The only problem with it is that you can't change the orientation of the heatsink i.e. you can have it facing forwards or backwards, not left and right. I guess sometimes they can be difficult to put on as well, certainly with the cheaper stock ones.
it can be that you have to apply a lot of pressure with a screwdriver, but if you're careful its fine. i remember the locking mechanism on my zalman 9700, once you got the hang of it it was so easy and simple to do, and the contact was excellent
