I am happy to say it's working well. Laptop is in my sig. I think the new HD and 4 GB of ram is helping. Boots up and shuts down about the same as SL. A few months ago I removed the 120 GB stock HD and put in a 320 GB Seagate 7200 and installed SL clean from my upgrade disk. I admit it probably needs some updates and a newer machine to really appreciate, but my machine doesn't seem any slower than SL or anything and it's near the minimum requirements. Just wanted to share my experience in case anyone with an older C2D was considering Lion.