You probably know of this already but the transitions between low, medium, and high rez don't always go back to their origional positions if you cycle through them, that means if you don't undo you can perminantly deform your model by just going to low rez and pushing it back up to high rez.

Also another thing I noticed is that I couldn't find any sort of merge tool. But you might already have one, I'm not sure.

On the other foot, I love the modeler so far, it is very easy to pick up and go. Very user friendly excelent job.