I use one too and actually look forward to putting now.
On fast greens I do find it a little heavy at times but ball always goes close to hole..might not always finish close..but is always online..
My brother got a nice putter from a putter manufacturer in N.Ireland.he can add weight to the putter head to allow for speed of greens.
I'll be playing with him on Friday so I'll get name of it..some new company trying to get a name for itself..but finding it hard to get the cash for Pro's to endorse its putters.
Brian.