You have entire community making guides, why would you need to buy one? It is pointless. Just wait for a couple of days, enjoy the game and guides will be out. Simple as that.
![Smile :smile:](http://gamesas.com/images/smilies/icon_e_smile.gif)
This has not been my experience. If one looks at UESP today, it has tons of info on Oblivion, but that's due to how long it has been out.
I generally find that while info starts to trickle in after a few days, it's rare that the info I am currently interested in is published yet. After a month or so the info is semi complete, but that's a month too late for me;)
What I like about the guides is that it tells me things other folks won't know and it does so on day one. Things like the pros and cons of taking various perks, strategies for role playing various character types successfully and just tons of other stuff. I generally try to get the strat guides for BGS games a few days before the game releases so I can be up to speed on the basics, got my tips and early game strategies, have a solid understanding of getting the most from the crafting skills etc.