I'll just be up front and say that I'm not nearly ready to purchase this game yet and it will be awhile before I can get into it. Judging by some of the glitches, that might be for the best. It is, however, a game I'll probably want to buy eventually anyways.

First, does is it just have the core classes, or does it have the base classes as well? One of the things I like about Pathfinder over 3.5 is that Alchemist is an option as a class, even if it's mostly implemented as a "selfish wizard/rogue".

How is the exp curve? Will I be able to achieve level 20 by the end of the game, or is this more like Baldur's Gate where you're expected to carry your character forward into another adventure and so level 20 is out of each?

And...

Is there any particular advantage to one edition over another?

Thanks!

They have included Magus, Inquisitor, Alchemist, Druid, Warrior, Ranger, Rogue, Barbie, Sorcerer, Wizard and Cleric as base classes, with 3-4 sub classes each, and there are also 5 or 6 prestige classes.
Not finished the game yet on account of gamebreaking bugs, so no idea what you end up at xp wise, but i can say that progression is very slow.
It can take you almost an entire day just to reach lv 6, but the game is also gigantic, so there is a good chance you can reach 20.
Aside from the bugs, if i have 1 critisism it is the broken english most of the game is written in.
It is a very bizarre experience, as the narrative structure seems to be in place, but the sentence structuring and writing in general is often very lackluster, complete with an overuse of exclamation marks for some reason.
A few bits and pieces here and there are very well written, like the companion noc noc, while other parts are almost indecipherable. Basically the writing is allover the place, but it is still a very fun and addictive rpg.

In situations like this I honestly wonder if it's really the devs that set the release date or someone higher than them.

Executive meddling and all that.

Regardless, thanks for everything. It does look like it has what I want, it just needs some fine-tuning first.