I've got the B5 book, too.
Personally, I find the printing in the book almost unreadable. The page backgrounds are a mottled medium gray and it wears me down quickly. The sidebars are on even darker backgrounds, I use a bright light and a magnifying glass on those. And this ain't my eyes. The ink on the pages is so heavy that if you rub something against them you get black streaks across the page.
That said, there's a lot of good material in the book for running a B5 Traveller game. The careers and alien race character generation are covered very well, for those that want to really have the chargen tweaked to the race, career, and B5 environment. I don't have such a strong need of this myself, the chargen material in the core book is sufficient for my players (most of whom are B5 fans with a better knowledge of the universe than I--I have to stay on my toes with them.)
The basics of equipment are there, but the equipment listings are not extensive. There are some sample ships, but not many. The designs are fairly odd since they retain the fuel-based power systems of standard Traveller. It makes for some strange uses of internal space as far as B5 is concerned. On the other hand, it allows easy use of regular TMB and MgT HG ships within the B5 universe with the only change being there are no jump drives in standard B5 canon, only jumpgates and jump point generators. These differences are covered reasonably well in the book, though the errata PDF download clarifies things some more.
The core characters of the show are called out, and the B5 psions are handled reasonably well--I take minor exception to some of it based on what I saw in the show, but all the mechanics from the show are there, I would change the weighting of some of the powers.
There is a lot of text I consider "fluff" background, and a dearth of practical information about the B5 station itself--maps, layouts. Some locations are described, but their positions in the station, relationship to each other, and so on are left undescribed. Likewise a lot of features of the station such as intrastation transport. Given that the book seeks to justify a lot of the fluff text as background for those that aren't familiar with Babylon 5, I would expect more of this sort of core campaign material.
The book does a good job of setting up a campaign for sometime after Captain Sheridan's arrival on B5. If you want to run a campaign during the time prior to that under Commander Sinclair you're on your own and need to make some adjustments to the chargen events and such if you use them (one of the downsides of such detailed chargen event tables.) If you want to run your campaign later than the time covered in the show, there is info to support that.
The maps of B5's space in the book are incomplete and confusing. The errata improves things, but even those are inferior to others I have seen for the other B5 RPG maps. I think the attempt to use Traveller-style sector maps in a non-jumpdrive universe was counter-productive, particularly since they are not standard Traveller maps.
Overall I'm satisfied with it, but just barely. The book falls short of what I was hoping for with respect to information, but that there's enough in there to make it worthwhile. What is in the book has saved me time and effort in setting up the campaign versus rolling my own from scratch. However, I'm still spending a lot of time on the B5 wiki and Lurker's Guide getting information that I feel should have been included in the book.
The material that's there gives me a decent baseline for making other B5 conversions of my own (e.g. equipment, ships that aren't included, etc.) As well as enough of the basics to get a game started on B5.
Now I just need to transcribe the material I want to use from the book to a document where I can actually read it....
Edit:
The general equipment section is pretty poor. E.g. lists rope, no load bearing capacity given. Thanks, I think I coulda figured out what's given (length and name) without a book. And rope is typically sold both in standard lengths as well as cut off a spool, or by the spool, so even the info given is counter-productive rather than helpful.
On the plus side, my B5 campaign is going swimmingly regardless.
