Hi all, Since mid 2010 I've been using my MacBook pro 15"(i5 2.4 GHz, 8GB RAM, Geforce GT 330M, 256MB VRAM) as my all-round notebook. However, I never took the effort to upgrade it from its native OSX 10.6.8 Snow Leopard. As I'm now four versions of OSX behind since the Yosemite release, I'm wondering if I should update it by now. With some minor upgrades (8 instead of 4 GB RAM, 750GB hybrid HDD) it's still running fast and smooth as the day I got it. I would like to keep it that way for as long as possible. But with all the horror stories of older models getting slower and slower with the OS updates, I'm a bit hesitant to upgrade to Yosemite. Would you recommend to upgrade it to Yosemite, or it it possible to update it to an earlier version of OSX if that suits this model better? Why should or should I not update from Snow Leopard? Thanks!