My Thinkpad was very poorly supported by Debian Stale when I bought it. I guess it would've been roughly one-year-old at that point.
Debian Stable is definitely not so hot on a year-old laptop, though a newer kernel from Backports can really help.
I have a 3-year-old HP laptop and have been running Debian Stable on it for about 6 months now. It's been a fairly seamless experience, as these things go.
For newer laptops, I definitely recommend Fedora. It's the easiest way to get new kernels -- which are what you need for new hardware -- on the regular.
Will never be a new laptop distro - I'll bet you I can run Debian stable on my Thinkpad X200 without issue;)