Hi guys, I have a 52" exmark LazerZhp I bought in January of 2004. this is the 3rd mowing season with it. I only mow my own yard, so it only has a total of 130 hours on it. I an currently on my 4th set of blades. I've been using the notched high lift blades. I sharpen them every 10 hours. My problem is that they seem to wear ALOT. Shouldn't blades last more then 30 hours?? I mow a 2.5 acre yard, regular grass, sandy soil but not rocky. The edge area gets a curved wear pattern, like if you herld it against a baseball, the curve would be the same. The blade that is doing this the most is the discharge blade....so when I sharpen them, I rotate them also. I do have sandy soil, and my dealer suggested using "Fusion" blades. They are supposed to last 2x as long for 50% more cost. They are about $45.00 a set of three, compared to $30 for a regular set. I was thinking of trying the gator type excalaber blades, but I've been told here that they clog and clump the mower deck. Any thoughts?? Thank you in advance for any help. Frank D.