Are there any stringing machines you have personally used that you would not recommend, or machines you have personally seen others use that you would not recommend? Blanket "don't buy this brand" stuff isn't what I'm looking for here. I'm looking for opinions concerning what specific machines should be avoided and why. For instance, if you've used a machine that lacks a certain feature and would not consider buying it because of that, post about it. Or, if you've used a machine with a flawed design, post about it. Thanks!