No OpenType features support of any kind, neither simple nor complex scripts. The development branch have some preliminary work to support OpenType but it may be a year or two before being releasable (if ever, they have been promising OpenType support for years now).

I'm using it as a prior design environment.

Some drawbacks : no OpenType advanced features, tedious text handling (some improvements on the way for the next version for the latter problem ; same goes for color — ginger koons is working on it: http://www.adaptstudio.ca/blog/2010/06/a-talk-about-open-colour.html)

Pros: of course the price, multi-plateform, and open editing format

The drawbacks are obviously overwhelmed by the pros, as you'll see in practice ;-)