I have been successful in running Ecco Pro 4.01 with the EccoExt update on Crossover Mac 14.1.4 for a solid week and have been very happy with the results. I've only noticed the following issues:
1) Occasionally I cannot collapse an item in Notepad view - this is easily corrected by adding a new item at the bottom of the list.
2) Sometimes when coming out of Sleep the CrossOver app will peg a CPU on my Quad-core system. Closing it and restarting Crossover/Ecco seems to fix the problem.
Just thought I'd pass this on since there haven't been updates to this application in a long time. I've quickly approaching 20 years of using Ecco Pro. It's very nice to not need a VM for this (though I could jump back to the Windows VM if I had to).
I should note that I only use the Notepad views (it is power. I've long ago moved my contacts/calendar elsewhere.