After getting the 2400 you may find yourself doing more work on it than you originally thought. This is true for most Macs (especially Powerbooks) you will find tasks to do on it. For just writing either the 280c or 2400 will do (I remember Nisus writer running at a really good pace on my pre-PPC Performa), but the 2400 has the benefit of a larger, higher resolution screen which means you can fit more of the paper on it. Just perusing eBay will show that for sheer budgetary constraints you can't beat a Duo. There are obvious benefits the 2400 has over the Duos I had queried this list ad-nauseum about my "Duo versus 2400" choice, I got the 2400 and I am finding that it deals with modern software rather well. And its the regular 180 mhz version. It is a little smaller and a little thicker than the Duos and I haven't noticed any difference in toting it around. As a matter it fits in my Motorcycle's tank bag easily, and I tote it pretty much everywhere so I can have something to fiddle with. The same is not true for my TiBook. I still have the responses from my query and will email them to you. It should answer your questions about Duo versus 2400. ~ Larry