As a launcher-only effort, I can definitely see the value in the key bindings. My hesitations remain:
1. It seems that you must manually configure twitch when a new application is added (although I'm not certain if it defaults to something for new apps...); whereas Quicksilver automatically indexes your applications.
2. You add key bindings, but lose the additional functionality that Quicksilver offers in its plugin system (sending mail, opening a web page, etc.).
3. Quicksilver is free.
All of these things considered, you have one major advantage - Quicksilver is not in the app store (and I don't see it getting there). You'll want to check out Launcher though, as it will be your primary competition and it has a lower price point.
1. It seems that you must manually configure twitch when a new application is added (although I'm not certain if it defaults to something for new apps...); whereas Quicksilver automatically indexes your applications. 2. You add key bindings, but lose the additional functionality that Quicksilver offers in its plugin system (sending mail, opening a web page, etc.). 3. Quicksilver is free.
All of these things considered, you have one major advantage - Quicksilver is not in the app store (and I don't see it getting there). You'll want to check out Launcher though, as it will be your primary competition and it has a lower price point.
Good luck!