Hi all. I've read all the 4 vs 8gb debate threads to death, but none have the answer I'm looking for. Basically, I'm looking for feedback from people who own the 4GB version as to how smooth does the laptop run. My last macbook was the very first intel core duo which I maxed out the ram to 2GB and it ran like a dream on Snow Leopard. So to those of you who have the base model, is there much lag etc in daily usage? I don't mind waiting a bit longer for applications to load, I just can't stand lag in the UI when navigating around. Note that there are plenty of 4 vs 8 threads already on the forum, I'd like to try and avoid that debate this time, hopefully the answers will give a more 'real world' feel for how the amount of ram influences performance.