It's strange, I have heard lots of people complain who wanted to give Linux a try (over Windows) and ran into hardware issues.

On the other hand, over the last ~15 years, I have almost never checked if a piece of hardware is supported by Linux (or BSD) before buying it, and I have only run into problems twice, really. One was an Aureal Vortex sound card for which a driver was maintained outside the Linux kernel tree, so I had to download it and build the module manually; the other was a really crappy HP scanner. Ironically, these days it does work on Linux much better (meaning: at all) than on Windows. (One key factor, though, seems to be not using brand-new hardware. After a year or so, chances are much* better it is supported properly.)

Apart from that, I have had no problems at all. Maybe I was just really lucky.