I am in the market to purchase a new sharpening skate holder, and I have always used the cam lever style holders. From what I can find online, it looks like the newer tri-lie holders are around $200 more expensive than the older lever style. My questions are: 1) Are the tri-lie holders are worth the extra money? (e.g. What is gained other than the ability for flat bottom sharpening?) 2) If I only perform ROH sharpening, does the third dimension just complicate the process of getting level edges? (Does the third dimension even get used with ROH?) 3) If I make the investment in a new holder, is there a style that fits more types of skates than another and might be the preferred overall purchase? (e.g. Does a goalie specific holder work just as well on a player skate, where as a general holder may not work as well with goalie skates?) Thanks for any insight!