Why do you want it? The deluxe hardcover of RIP that I read was beautifully put together - I would term it gorgeously put together. I am not that enthused about the art. But it was certainly not horrible (which I occasionally feel about certain trades). If you liked RIP, then by all means - it's a beautiful hardcover
On my first reading I was thoroughly confused by RIP. Then (as per recommendation above) I did go and get the trades from Batman & Son, The Resurrection of Ra's Al Ghul, The Black Glove and then RIP again. It was clearer but it still leaves a lot of things unstated. What is the meaning of Honor Jackson or ZurenArrh and so on.
There are people who love Grant Morrison and then there are others who don't like him so much.
One word of caution - the RIP harcover includes two stories that are in the Final Crisis timeline (called "Last Rites" I think). So about 3/4th of the way, you will suddenly get a little confused as some intervening Final Crisis stuff has happened that is NOT covered in the trade itself. So you don't quite know why Batman is in the predicament that he finds himself in Last Rites.
The wikipedia page on the
RIP event gives a issue-by-issue tie-in listing. It might make sense to read those issues too. But I don't think I'm going to get that chance unless it appears in a Trade.
{Edit: Just realized that you are just getting back into RIP after stopping reading Batman in 2003. Yes - you must read at least from Batman & Son onwards. I would not recommend jumping into RIP directly. Even with (most of the) background, I found RIP left several open ideas/concepts.
Have you read Batman: Hush? If not, I would strongly recommend it for the art (by Jim Lee) and for it introducing a major new villain in the Batman Rogue Gallery. There is an absolutely gorgeous Absolute Hush oversized hardcover that is very much a collectible. However some people criticize Jeph Loeb's plot in Hush as having too many of the Rogue Gallery of Batman appear in the same storyline. }