Last year I eXperieced numerous customer complaints on the accounts where the eXmarks w/mulch kit were being run & none on other accounts. The compaints were allways that the grass looked Pushed Down. All accounts are cut at 3-3.5" in the summer which is when the complaints started. It Was those Curvy Mulch Blades. This year all units are equipped with eXcalibur high-lifts & Notched & there Has been No Complaints. You can visibly see the difference where the curvy blades would push down the turf- the eXcalibur's lift it & leave a Picture Postcard Cut. Whats-up with those Blades---I bought Quantity when I bought the MM Kits-Now I want my $$$ back.