I like it and use it all the time, it does make a difference, but make sure you get the one with the bigger hole for when you are using zig zag stitches etc as I have been told you can buy one with only a little whole for straight stitch.
I find that as I have a table that the sewing machine sites down in it, and sometimes if you are lifting the machine up and down from inside the table to change the bobbin or for a clean out of that area the slider mat has to be moved as it sits just beyond the edge of the hole in the table so to speak, so yes the sticky stuff underneath stops been sticky.