Dear Curse:
One of the features that I really, really liked about WoWMatrix was its simplicity. The application, while not the prettiest in the world, executed easily, required no installation at all, found the addons easily and updated all of them with a single click. It did not support any other game, did not stay resident in the process table, did not collect any information from my system to send back to the mothership. It performed its function reliably and quickly, and did so across all game platforms.
Your client, by contrast, is larger and requires installation. This is apparently due to the fact that the client supports several games, rather than just WoW. The extra weight in the application comes with no value to me or other former WM users.
It is not a cross-platform application, as it runs only on Windows, and on Macs with specific versions of the operating system and only on particular hardware. Depsite assurances from Curse that this will change Real Soon Now(tm), the fact is that this client, as well as all of its previous versions, have suffered from the same platform limitations, and there has been no movement discernable to the userbase toward a solution. I don't need to tell you how long that's been, nor do I need to remind you how patience wears thin.
Unlike WM, your client requires a login, which is an inconvenience, and to those of us who like to keep track of precisely where we've placed personal information, it's an added and mostly unnecessary burden... albeit a small one, admittedly.
The biggest disappointment is the planned removal of the 1-click updating feature. Your statements, both on the site and in the application itself, inform us that we're eventually going to have to start paying you for this feature. Unlike the higher-speed and more-exclusive access that the premium account is also planned to provide, the 1-click updating does not cost Curse anything. Its removal is strictly and completely a tool to goad users into coughing up cash for a premium account, users who might be perfectly content to wait a few extra minutes for their updates. I'd like to ask that you leave the feature as part of the standard-access client.
As for a direction for future development, I'd like to ask you to reconsider your position of not making available a WoW-only "thinner" client with the basic featureset the client currently has (1-click updating, auto-scanning for installed addons, search/installation of new addons), as well as the most-asked for improvement: true cross-platform capability. Such a client would go a long way in providing good service for your users.