@save2600
I own a MicroA1 and run AmigaOS 4.1 Update 2 (the latest public version).
I am a user, ... not a beta tester or developer.
As I understand it, we use Reaction as standard.
However, we also have an AmigaOS4 version of MUI, called MUI version 3.9, for compatibility with MUI programs. This version of MUI comes standard with AmigaOS 4.x, and is installed as part of the system install.
I do not know what Poseidon/Trident are. I don't know what our USB stack is called, but I can use my Lexar JumpDrive USB stick and my Kingston DataTraveller USB stick and transfer pictures from my camera over USB. I have not tried hooking up a USB hard drive or USB optical drive.
Not sure what you mean by "complete" OS.
It comes with everything needed to boot up and function. The system is still under development, so new features are added to each release and there are some bugfixes now and then.
AmigaOS 4.x comes with NotePad, AmiPDF, MultiView, ARexx, etc. There are several programs included on the AmigaOS 4.1 Update 1 CD such as DiskMaster2, DvPlayer, IBrowse, OWB, SimpleMail, YAM, AmiDVD, DiskImage, DOpus4 and TuneNet.
However, it does not come with applications like TVPaint, Final Writer 97 or AmigaWriter.
So, for example, I added AmigaAMP, KingCON, Final Writer 97, WarpView, PPaint, TVPaint, Real3D, MakeCD, AmiDVD, CinnamonWriter, NetSurf and Timberwolf. I currently have 5 web browsers on my system, AWeb, IBrowse, NetSurf, OWB and Timberwolf. AWeb and IBrowse are old now. I keep them mostly for nostalgia reasons. NetSurf and OWB are newer browses. I use them the most. The Timberwolf version I have is a very early (alpha) release version.
There are print drivers for some printers but not all. So, for example, I can't print to our Epson Stylus CX4800 printer which we use with our Windows X86 PC system.
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redfox