Does the SSD make that much difference? The processor is not much beefier, what are the other factors I should consider/which have an impact? Anyone made the same upgrade and happy with a significant improvement? Or am I just wanting a new shiny thing?
The flash storage makes a huge difference (a fresh system boots in about 15 seconds, apps will start instantly etc.), and the new MBA does not need to throttle the CPU when it gets hot. So you will probably notice a big improvement. See Macworlds benchmark results, for example.