Simone12, we bought in Phase 2 in 2003, but would say that Phase 3 is coming along well - take a look at some of the photos. I don't know about ADH really, but it's unfortunate you bought at a time when the property market isn't doing too well on resales. If you bought for investment purposes, short term really isn't doing too well - although, if you can afford to hang on to it, long term you should be okay. We bought long term and are really happy with our apartment, which we completed on in February.
If you really need to sell, maybe look at marketing it everywhere and not just with ADH - put an ad anywhere you possibly can. Peoplle are buying, but you may have to wait until it is at least a few months away from it's habitation licence.
All the best!