I bought the Blade Stabilizer for a new Fillet Knife that was just to flimsy to sharpen without it. On the first try it worked better than expected. I recommend the Blade Stabilizer.
I have had the Gen 4 for nearly 2 years and have added several accessories to round out it's capabilities. I regularly bring it to work and sharpen anyone's knife that is interested. I bring it to my church's monthly men's breakfast and take care of anyone's pocket knife or kitchen knives. My mom is an avid quilter and I have sharpened all of her quilting club's members scissors. I do all of this for free because everyone should have a safe and sharp knife!
I like the consistency of angle and ease of use. I especially like to see people's reaction when I show them just how sharp it is!
I have been enjoying learning this new system. Great results so far.