The only thing I can suggest is click on the links above
forecast/beta have a read through the manual.

The only main problem I am having with is using shadows.
But that could be due to my grafx card or a broken driver.
Been to lazy to update my drivers hehehe.. Geforece 7600 GT PCIe

The A7 is still going through heavy changes. A6 has been proven stable. I am still a very novice devoloper and I found them
both pretty easy to understand. There is a good community here
so if you get stuck you can get help very quickly.

With the AUM it's also good for tutorials and a new AUM generaly
comes out once a month.

I could go on forever here but if you really want to know the
difference download and try both A6 and A7 demos.
Remeber you can't use lite-c script in A6 though.

Oh also read the gamestudio's main home page on features/ litec etc.
That's the best way instead of waiting for a reply in the forums.