EXTREME X Trimer Line .... I was in lowe's yesterday and noticed this NEW trimer line, EXTREME (maybe) X or something. It's grayish in color and as always it cost more than the others. I have been using the SQUARE and STAR shaped trim line up until now with reasonable success. Does anyone have any experience with this line? How good is it? How does it cut? How long does it last you? Thanks in advance. .