Absolutely worth it!
I was fit for new irons and a driver shaft last November when they had their fitting sale. Now a year later, my handicap has dropped from about a 10 to a 6.5, so I am now shooting in the 70's. The new custom fit clubs were very much a part of this improvement.
This November I went down again because I was struggling with my putting. As a past customer, Joey Simon did not even charge me for this putter fitting. With their SAM putter system he found a putter that was consistently more accurate for my swing than either of my 2 old ones.
Without these custom fittings, I suppose I could have stumbled around trying to find something that worked this well for the rest of my life - and never found it!