I have one with grooves on the levelwind and mono is all I ever fish. FWIW, I'm not even worried about replacing the guide yet as I've seen no issue with it affecting my line. It is annoying to have to have it in the back of my mind, but I still love the reels (particularly for the price online).
Yeah im still using mine with no issues as well. I even ran a q-tip across it when I had it off and it didnt grab or snag it at all so I figured it was good till I could get it replaced.