I recently purchased the Jasper Jig Model 200 unit to hopefully make cutting circles easier and quicker. I must say that it does work as advertised, however there were some issues that caused me to throw it away after just a few uses. I could have emailed this post, but their website is outdated and the email address is no longer valid. So I might as well post it all in case your tempted to get one of these things. 1. The silk-screening for the Model 200 should be on the topside of the jig, rather then face down while attached to the router. Although not difficult to match up the pinhole with the correct diameter marking, it was an inconvenience to half to look a little harder using sunlight to find the exact hole. 2. The choice of material for the Jasper Jigs is not adequate. It should be made of Lexan, or aluminum (preferred) this is why I threw mine away. It was not rugged enough and cracked at the mounting holes when I was moving my router with the jig attached off of my worktable to another location. Acrylic is a rather strong and flexible material, but can also be rather fragile and crack. Lexan would be a better alternative. But ultimately if it were some type of aluminum, it would be rugged enough and last forever. 3. The manual although fine for it's purpose, I felt that it could be improved upon. More pictorial's, and more tips rather then just text. If I'm going to buy another jig, I may get one of these. http://www.glassmanscustomforum.com/tools.html A lot more expensive, but should be much more rugged. Oh and you can never have enough clamps! I have a couple C clamps and 4 24" bar type clamps and I could have used another set of 4 bar type clamps.