I recently ordered the Rough Guide to Las Vegas which was issued April 2011, stating a first edition. I have to say that if that's the case I'm very surprised one hasn't been written before.
Personally Rough Guides are my favourite of the main stream travel books, I like the familiarity of the layout, and previously when travelling we've found some really good bars and restaurants we'd have certainly missed if they hadn't been Rough Guide recommendations.
Things I liked about the Vegas version. Having a description of all the strip hotels, with their main amenities in one place I found helpful. Even though I've had one short trip to Vegas last year and read this forum religiously I still sometimes get confused as to what bar/restaurant is where. Previously to this I'd struggled to get a guide book with enough detail that was also small enough to carry around easily.
I also like the fact that they have floor plans of the larger casinos, and after getting hopelessly lost in a few last year I'm sure these will be a great help in 4 weeks time.
The chapters are broken up by topic, as you would expect in a Rough Guide, bars, restaurants, outside the city, gambling, shopping etc. However, I would have liked more detail, especially a wider listing of bars and restaurants, although the fact they wrote about the basic rules of casino games I think will be helpful.
Although they have the publication date as April 2011 I'm afraid it's already out of date, and really needs to be used in conjunction with a topical website such as TA. They mention the Cosmo but say it was yet to open at the time of publication. Claim that the only direct flights from the UK are with Virgin, and yet we're travelling direct with BA this summer, still have the Titanic exhibition in the Luxor as open, and of course no mention of the closure of the Sahara, although they do mention it could be in the cards in the future.
All in all not a bad book, I'm glad I bought it and I'm sure it will be useful on our trip. But be careful of some of the details and use a more up to date media as well.