I've seen those and know guys who prefer them but I've never tried em always used the smooth guards with an underserrated sickle. a set of guards generally lasts me a season, this year cut alot of crp hay and with all the mole hills in there really wore out my guards quick. should replace em but I'm trying to make it to the end and don't have alot more left to cut. Generally put up 3000 to 4000 large round bales a year Not sure on the acres cut haven't tallied it up, kinda varies from year to year.
I also agree completely with the guy who said to reduce ground speed to cut that fine thick grass. Thats sound advice I forgot to mention. :thumbsup: