It's a decent copy, slightly wonky pages in places, and amusingly the Near Star Catalogue book has "GDW Library" stamped on the top of every other page
Some wonky pages, and it would have been nice to have the star map as one large PDF section instead of crudely cut into chunks. Nice to have, but the low quality of PDFs that are simply scanned in haphazardly the way DriveThru are doing it is one of the reasons I won't buy anything from them.
I came to much the same conclusion: I own the books (both sets) and so, with my scanner, I feel I am closer to the kind of electronic version I want than what they are offering is.
I think it's really sad, but in both cases I said, "Even for free, it's not really something I want. Not with how badly it will have been scanned."
From the different (scanned) Traveller/GDW products that I've seen (including a copy of the T4 Naval Architect's Manual), the scanning tends to be relatively mediocre. Tilted pages among other flaws seem to happen with somewhat annoying frequency.
On the other hand, at least the material is available.
I don't really care about tilted pages (it's not like they're REALLY wonky). As far as I'm concerned, it's readable, and it's free, and usually if there's anything wrong they'll fix it if you tell them.
I'm rather glad. I lost my directors guide years ago, and haven't been able to find a replacement (mind you, I haven't been looking that hard). The scanning is much better than some of the stuff on DriveThru, the Twilight 2000 2.2 rulebook is unreadable in some places. And its for free as well. To quote one of the great philosophers of our time "Sweet".