How Good is the AT&T 6300 Plus?

[Mitchell R. Gass]

I haven't seen much on the net about the AT&T 6300 Plus.  Can
anyone tell me:

  - how the UNIX available for it compares with versions of UNIX
    that run on other micros (in particular, the PC-AT)

  - how IBM-PC compatible it is (does it run all those PC-DOS
    applications?  Does it accept IBM expansion cards?) 

  - how reliable it is

Both praise and horror stories are most welcome.  If you looked
at the 6300 Plus and decided on another machine, can you tell
me why?

Thanks!

Mitchell Gass
{decwrl,hplabs}!pyramid!amiga!mitch