I use a Linksys wireless router and had no problem setting it up, however I know a lot of people that could never get it to work properly and gave it up for the much more expensive Airport because the support at Linksys was horrible.

Apparently they have fixed this with their Linksys EasyLink Advisor (LELA) Setup Wizard for configuring its wireless routers on Mac OS X.

From their site:

Now, the LELA Mac Wizard takes the setup process to the next step, streamlining the router installation. To access the LELA Mac Wizard, simply insert the CD-ROM included with your new Linksys router into your Mac, double-click the CD icon on your desktop, then double-click the Device Setup icon, and LELA will take over.

Looks like they realize that the Mac market is expanding rapidly and see an opportunity. Hopefully this will become a widespread trend.