Migration from 7.23 to 9.20

Hi All, I have a client that is going to migrate from 7.23 to 9.20. I follow this list pretty close -- but just started looking for any stories/problems doing this migration. I can't remember seeing anyone having gone through this. Does anyone have any experience with this -- and if so, did it go smooth, where there problems, etc. Here's the details of what is going to happen: online from 7.23 to 9.20 4GL from 6.05 to 7.20 esql from 7.23 to 9.21 (some applications still on 7.13) This all runs on solaris -- but I'd be interested in experience on any platform. Any info or insights greatly appreciated. TIA, Tom Grenier