I bought the Dritz See-Thru Dressmaker's Ruler as it had slits at different measurements. 1/4', 1/2" etc. I thought it would help with marking for the 1/4" seams. It did not say "Quilter's Ruler"!
The spaces are so wide, it is useless.
http://www.sewingmachinesplus.com/dritz-dr-621.php
Last week I used the 1/4" tape by Collins on a quilt I was making. I couldn't remove it after sewing even though I didn't sew on the tape itself. When I called Collins, they told me it was actually made by Dritz.
I also had a problem with a seam ripper they made, the little round ball fell off.
I will never buy one of their products again, at least no knowingly!