The $10 download fee is really it's only saving point for me.
The inclusion of all the new elements fit very poorly in with the original and make it hard to enjoy the core game.
Artwork: The original was beautifully drawn and animated, and the new artwork is thick and animation clunky. The problem is that it's intermingled the new into the original so you have the original art style comparable to classic animation like Black Cauldron and Secret of Nimh, mixed in with thick lined vector style animation that looks like a Flash cartoon.
The face shots during conversations do not move but a few times during the conversation and the inclusion of larger, bulkier, poorly animated 3d characters makes the whole thing feel inconsistent and rushed.
The new story elements as well as the new audio feel exactly the same way, they just don't fit and you'll find yourself fighting to reconcile the new and old elements to make sense of it all and enjoy.
They also added more clues such as audio cues and a radar to find items to pick up and interact with so there isn't much challenge and satisfaction in solving the puzzles.
All this being said, don't buy this if you're looking to experience this game again, the new stuff really derails most of what made the original so great. However, if you've never played this game and ONLY have a mac, it's worth the 10 bucks and you'll still enjoy the story as a whole, but the inconsistencies across the board are pretty apparent and annoying.