I've not used this app myself, so can't post this to the App Directory. However, I thought the feedback I got from the developer when asking about VoiceOver support was worth sharing. If nothing else, it might save somebody from spending $8 on an app that isn't yet accessible!
Anyway, here's what they had to say:
"Thank you for your feedback. We have had several requests to improve the accessibility of Office² HD. There is a fair bit of work to do so because both the spreadsheet editor and the word processor are written from scratch and don't use any of Apple's existing controls and therefore cannot take advantage of all the work that Apple has put into making many of their controls and widgets accessible. We will at some point be evaluating the work required to do this."