I'll keep this brief, odds are that you aren't browsing through the Moleskine listings on Amazon without you being a big fan of these wonderful little notebooks. That being said I'll skip over the basics, as you know this is a top notch notebook the likes of which only Moleskine can bring to market.
The Lego integration is just perfect for me - I just wanted the hint of Lego, the brick on the front, the custom sticker sets, the embossed minifigs on the cover and the really neat inside artwork... all of it leads to another amazing product. Moleskine notebooks are just the best that there is, their quality is legendary for a reason. They are 4-5 times as expensive as a lot of alternatives, but there really is a huge difference you'll notice when writing in a classic series Moleskine versus some Five Star Mead mass-market crap.
If you love to draw or write or do anything involving good old pen and paper, and you are a bit of a Lego fan, then this is the edition for you. Collectors of rare and limited Moleskines will most likely enjoy this edition as well - it certainly does make a good conversation piece. The only minor complaint that I could make is that, once removed, the sticker sheets are very hard to get back into the back folder, but that's a minor quibble. This product is functional, fun and fantastic, I can't find fault with it at all.
If you care about writing, buy Moleskine.