Lots of MBP/Air users here... :-)

However, at my office we've just ordered some Lenovo x121e's. All have an i3 processor, 8GB RAM, and SSD's. The speed is great, but the screen isn't so large for those of you that need large screen real estate (11.6"). We ordered them for portable "workstations" or something powerful and speedy enough for basic development tasks.

Battery life is great at about 6-8hrs, however the price can get quite high depending on your configuration.