You've completely omitted the real reason people stay with Digg: network effects. The more people using a Digg-like site, the more valuable it is. Digg clones d

You've completely omitted the real reason people stay with Digg: network effects. The more people using a Digg-like site, the more valuable it is. Digg clones don't have the traffic, so of course they can't compete. Switching from Windows to Mac is more of an issue of legacy. If all of the software you like using works only on Windows, and if all of the people in your organization only know Windows, it's going to be difficult (costly) for you to switch. How are these related to 37signals products? Not very. There are no network effects involved, so that's out. And while you may have a legacy with 37signals, it's such a new product, your organization could probably afford to switch to a competitor without much cost. The question posed in the article is a good one, then, since if you could match feature for feature and you could do it for cheaper, you'd beat 37signals at their own game.