Excellent quality and does a great job of holding it at an angle while the glue dries. I just did 1600 square feet of lap trim that mitres in the windows, and keeping them all the same was perfect.
Pros
OPENING AND POSITIONING CLAMP: Use a spreader tool to open and position the included spring clips, holding all corners firmly in place; 3.5" (8.9 cm) long rubber grips provide comfortable, non-slip grip