I have S-flex in my Driver, but my Hybrids and Irons are a Firm flex. Ultimately, the flex I use depends on the shaft. My previous set of irons had S-flex shafts in them because that shaft tended to play a little softer.
I've counted 5 putters currently.
Heavy Putter D1-M
Maltby Max Moment
Odyssey White Ice 2 Ball F7 (selling this one)
Killer Bee mallet (don't recall model name)
Distance Master (similar to current AS5...