File Format between versions

One of the things I’ve been doing recently is to rewrite SQLEditor to use cocoa instead of java’s swing toolkit. This gives a much better application for people using Macintoshes , but it has meant a file format change. The old format relied on java serialization which isn’t possible under cocoa.

The key question is this: are users willing to swap the superior performance and extra features for the hassle of exporting and reimporting their data?