matrebatre,
I am throughly impressed.
I am a 100% amateur when it comes to modeling and this program (along with the tutorials) made it very easy for even
me to understand how to use it... and since it is directed toward modeling for Game Maker (naturally), then there is no longer a need for anyone else new to modeling to hunt down a free modeling program on the web (if there are any) and then hope that the exported files can be converted to format that Game Maker can read. I may even consider modifying a project that I was working on in 2D to include 3D as a result of this program because the model creation was the one thing holding me back from doing so.
Another point (though is usually taken in mixed context for the obvious reason of this being the official GM site), it is quite a treat to see something well designed (especially an application) created with Game Maker that does not
look like it was created with GM (other than the loading screen). Regardless of how great and powerful we know that GM is when its potential is used effectively, almost everything created with it has a certain "feel", whereas applications created with other programming languages -- on the surface anyway -- aren't always as easily distinguishable.
I downloaded this several days ago, but only just now got around to looking at it today, so it is possible that this has been fixed already. I'm simply nitpicking the terminology: for model preview, when clicked it reads "To preview the model, you
should save it first. Do you want to save the model?" and you can choose"Yes" or "Cancel" where "Cancel" does nothing. If you do not allow preview without saving at all, then the word "should" should be changed to "must". (What can I say... I had to find fault
somewhere!

)
The only improvement that I can think of at the moment would be the ability to shift the views in 3D mode and model preview parallel with the planes so that any section of the model can be more-easily zoomed in on (since, as of right now, the spherical rotation and zooming are fixated on coordinates 0,0,0). If I created something really tall, I would have to zoom way out to see the top front of it in 3D, and might end up too far away to actually view for detail.