Each putter in the shop has its own unique meter increments. Make sure you read which increment you are buying. Some people I know at higher levels really don't like the 15-30-60-etc. range much at all and it might take you a long time to get used to the switch, especially if you like to do the math in your head.
I have been playing with my level 30 putter for 65 levels and I love the 10-20-40-60-80-100-300 range but unfortunately they only make those meter increments on a very few putters and none of the really good/high level ones. Not sure what I'm going to do when I finally decide to upgrade.