Great product. I put up a full review for this at Mactalk on http://forums.mactalk.com.au/20/67003-layers-app-review-screenshot-layer-perfection.html

Hi there

Would be nice if you actually gave the ability to refresh the trial license with upgraded versions. I tried a copy of a previous version a while ago and have not been able to try any new versions of it ever since because I now receive "Your trial has expired" message so although the previous versions did not meet my requirements, I now no longer have the ability to see whether any future versions of Omnigraffle have the ability to swing me.

I understand you have to try prevent people reusing trials but there are ways to handle this like refreshing the license on upgrading the version for example, or simply putting an expiry on the beta license so it can't be used past a certain date (like Merlin do - download a copy of their software, you might be able to learn a better method of handling this).

I'll try the product again when you manage to resolve the licensing issues for trials, until then I'll continue using my Visio, because I can't see whether later versions are capable of matching my requirements.