I've built quite a few amd systems, for myself as well as others and recently prefer an aftermarket cooler. To give you an idea, I have a box for an h60 I installed for someone recently, a v6 gt on my system, and an aftermarket cooler master just sitting until I need it.
Will the stock work at stock speed? Probably. Would I trust it? At stock speed, no overclocking. If you are overclocking, grab a host 212 evo. They are cheap enough and help a lot. I once worked on a system with an fx 6100 where the cpu had literally cooked over time due to the stock cooler. It was a kid's gaming pc. Installed a new cpu and 212 evo, solved a lot of issues.