How Good is the AT&T 6300 Plus?

[h.cohen]

Mark Gauldin's detailed reply was very constructive.
One small correction, just for historical accuracy:
The AT&T PC6300 is essentially an Olivetti design, and the equivalent
product is sold by Olivetti and others.
The AT&T PC6300 PLUS is entirely an AT&T design, and is manufactured
by Olivetti under a simple contract.  The design is proprietary,
and make the Simul-Task integration of MS-DOS and UNIX practical.
Harvey S. Cohen, AT&T PC6300 PLUS prodcut mgmt., mtuxo!hsc