They work very well when paper piecing. Pins are difficult to push thru the layers of fabric and paper without distorting the pieces; holds layers of paper & fabric together to sew the sections together and are easily removed while sewing seams. I also use them for long seams even when not paper piecing, again because they don't distort or move the fabric. They're great for attaching binding.
The advantage I've found with the Clover clips over office binding clips is the ease of removal when sewing towards them; with little pressure they slide right off the seam line being sewn toward usually without stopping. I found the office clips held a little too tight, had to stop sewing to remove them. (I still use office clips when my project is too large for the number of red clips I have).
Onebyone, have you seen the new packages of Clover clips? Lots of sparkly colors--you'll like them LOL!