Rat,
Hows the new machine runnin'? I have to say the new Botas' are quite impressive. Anyway the carbide tipped roller is ten times better than the bar roller,it gives more of a tilling action, and works great for lawn renovations like you want to do. It really tears the old sod up pretty good, especially if you go over it a couple of times. It is a bit pricey to convert, but is well worth the doe. Ive had mine set up with the carbide teeth for about a year now and they haven't even shown a bit of wear, keep in mind that I also grade hard packed driveways with it. Hope all is well on the Left side , the weather has been horrible here, hope it has been better for you out there, you wouldn't want to get that new machine all dirty!!