I've had quite a few in the last 5 years, as I was never impressed or comfortable. I now have an 13" HP Spectre with 8 gigs of Ram, 256SSD and i7. It is an amazing machine considering it's small and a convertible tablet. At my office I use a Dell Latitude (company issued) with an i7 and 256SSD.
The SSD and late gen i7, at a minimum, have been the way to go for me.