Using the TOR-SE77 square edge tool holder immediately increased the accuracy and speed of my tool finishing. They are worth the price paid, but you need to take your time and practice for cheap reasons to become proficient. Setting up the BGM100 takes some time and thought, hence the 4 stars. First try: I installed mine exactly as directed, but it was too close to the stone (I kept tapping my fingers on the Delta grinder's quick-release hub) and not well placed. The second time around I took my time and adjusted by feel, estimating how wide my widest blade would be etc. Also playing with adjustable height (good option!) was the ticket. It turned out to be MUCH better and safer. A NOTICE. There's a learning curve with these tools, and if you're new to sharpening and reshaping (I'm kinda new), take your time and practice on something old or priceless. I recommend a variable speed coffee grinder if you can afford it. Delta is fine. And loose aluminum oxide discs are way better than the cheap gray discs that come with the grinder.