I love my two CBN wheels (80 & 180). My question is which one should I buy next? For me the choice is between 350 and 600. I am planning on using this for my bowl and spindle gouges. I attended a couple of very interesting workshops with Tom Wirsing and he had all of these.

Has anyone tired Ken Rizza's (Woodturners Wonders) cheaper ($99) wheels? He has them up to 1000 grit.

Cheers,
David