On my recent Arizona / Las vegas trip, everyone I was hanging with had a Scotty Cameron putter. Now I'm never used or held one so I never seemed to see what the buzz was given they run like $300-$600. For a putter. A single club. Now I know, you use that club for like half (or more sometimes) of your entire stroke count so I don't mean to minimize that importance but I guess I was always able to putt pretty well with putters of half or a third of that cost. To me, putting is mostly about feel. I think you can be a decent putter without buying an expensive putter.
Now that being said, I had the chance to putt with a Scotty Cameron Golo Caremon & Crown putter while I was on my trip to Arizona. And I have to say that I was impressed with the weight and balance of this putter. It felt a lot more solid when I struck putts and the roll was very consistent. It seemed easier to get the speed down on those greens more so than it was with mine but by the end of the round (with my putter) I did have my playing partners saying they were impressed with my control on greens of theirs which I had never played.
So at some point, given a good price, I might invest in a Scotty now that I've tried it but I think for most mid-high handicappers, I still think it's better to invest in lessons than a $500 putter.