Experience with Third-Party memory (Cisco)?

[shawnl at up.net (Shawn L)]

With all the talk lately about the growth in routes, I got to thinking
about upgrading the memory in a couple of my routers.

Does anyone have experience using third-party "guaranteed compatible"
memory.

With Cisco's discount it looks like I can upgrade for $5k vs $700 with
third party memory. I'm just wondering if others have used it, and how it's
performed, or if it isn't worth the risk.

thanks