Your level of comfort will be determined by how comfortable of a chair you are sitting in. ;)
I don't know what has gotten into me today with these wise cracks.
A lot of people use their axims for eBooks. And there are even some copies of illegal eBooks that you can obtain. I just don't like staring at the little screen for text, so I don't use the device for eBooks.
As for surfing the web, no, it's not very practical--yet. Can you do it? Sure. Does it work? Yes. But you'll either find that you have some choices with the limited browsers out there...either the entire page will be in one column, requiring A LOT of up/down scrolling, or you'll have the default screen which will require a lot of side-to-side AND up/down scrolling.
The programmers are working on this. They're trying to make a version of Firefox (Minimo) for the Pocket PC, which just had a new version released, but it's not so great yet. It will be. And I expect browsing capability to be improved with the bundled Microsoft programs in Windows Media 5.0, which comes out for the X50 in about 2 months.
There are also some other browsers out there that you can buy...you should probably give them a look, too. You'll want to read this post by Menneisyys:
http://www.aximsite.com/boards/showthread.php?t=93085