I, and many others, have left feedback on older versions. Alas, it has disappeared? Versiontracker, where is it?

Version 6 appears to be a minor upgrade. Alas, the dictionaries have not improved significantly. UL seems to emphasize compactness. In an era of 500GB harddrives, this emphasis makes no sense!

The gold standard, Robert Collins is so superior that a comparison is useless. Currently, I am considering investing in Parallels for the sole purpose of having access to the RC dictionary on Windows.

In addition to UL's unwillingness to include a truly comprehensive dictionary, they employ a nasty practice on upgrades. Previewing version 6 is a one-way street. It completely wipes out your version 5 install with no way to recover. They do not warn you of this practice. I was fortunate enough not to have any customized libraries. However, if I did, this would be a disaster.