Upgrading to 1.7 went fairly smoothly, but I found the upgrade.txt file a little confusing.
It doesn't mention upgrading from 1.4 on J!1.5, which seemed a little odd. I assumed that the latest CB version on J!1.5 would be alright.

It seems to have worked properly, except the CB plugin that I added has disappeared.
In fact it's only the entry in the tables #_comprofiler_plugin and #_comprofiler_tab, but it's a little annoying since the file says that all plugins will be preserved