GDP, computer aids

  I just received one of their "catalogs" today.  Under the heading of to-be-
released-real-soon-now they have two computer programs.
  One is star system data covering 37 sectors "in and around" the Imperium.
The data is compatible with the second program.  They didn't mention how
up-to-date the data is, ie pre vs post shattered Imperium.  Although they
do call it "Second Survey Data" and if this corresponds to the Imperium's
Second Survey then it is pre-shattering.
  The other program is a computerized version of the World Builder's
Handbook.
  Both will be available in "Late 1990" for Mac and IBM.  The Mac version
of the system data is in Hypercard format.

  Does anyone have any opinions on the following DGP products?
	Traveller's Digest Magazine
	101 Vehicles
	Starship Operator's Manual Vol. 1
	MegaTraveller Referee's Kit
	World Builder's Handbook (Although I think I will wait for the computer
				  version.)
	The MegaTraveller Alien, Vol. 1: Vilani and Vargr: The Coreward Races
	Manhunt: Vol 1 of the Onnesium Quest Trilogy (an adventure, I Guess)

  Are they good, bad, useful, not useful?  Do they have lots of errors?
That sort of thing.

Thanks for any info.

Andrew
[email removed]