I will state as a preface that I use windows scaling at 150% default on 27" 2560x1440 monitors. I largely do this for the readability of the EQ UI. This may be affecting things like button sizes/etc (I'm going to look into it, and if so, change the scaling if I'm able).
Some things I have noted:
* I think the easy update button takes up too much real estate, there is a lot of unused space with a centered button of that size. See preface note, however.
* I don't see a clear indication that an update is available for MQ without hitting the button (this may simply be because I have not yet encountered an available update while using Redfetch!)
* The settings tab is much improved over the old launcher, its streamlined and simple while having everything I need.
* The Special Resources feature (and especially the maps) is a wonderful idea. If it has not already been considered, I think EQLogParser would be a good candidate as a built-in special resource if it is possible/permissible (I understand that there is a way to manually add special resources myself).
* The shortcut tab is wonderful, I would love the ability to perhaps select some of the shortcuts to display on the fetch tab as a user customization. Maybe in some of that dead space near the easy button?
* The startup sequence/first install is absolutely adorable.
* I think that it may be nice to be able to de-select resources or exclude them from the easy update list while keeping them watched (as watches have use beyond updating in redfetch like notifications/etc.). This would also have the benefit of being an addon-wide protection, without needing to manually edit anything. For now, I have read the instructions on locking particular files, and to be honest, I'll just keep my manual edits read-only as I was previously doing.
Overall my impression is positive, I'll likely continue using it. Fwiw, I haven't tried RGManager yet (I intend to).