New to this forum malarky, but i'd thought i'd stick down my experiences. I play titleist cb712s. Had them fitted professionally with s300s, 2 deg upright, and 1" longer (i'm 6ft 3" tall). Rubbish. Took them back and had the s300s replaced with project x 6.5s, standard lie and 3/4" longer. Sooooo much better. The s300s felt far to heavy for me personally and strangely "loose" would be the best word. The Project X's are lighter and I feel like I get more feedback throughout my swing. Don't plan on changing this set up for the foreseeable future.
In the bag:
Titleist 910 9.5deg driver - Aldila RIP 60 Stiff shaft
Titleist 909 D3 3 wood - Fujikura Zcom Pro95 stiff shaft
Titleist 909h 19deg hybrid - Project X 6.0 rifle shaft
Tilteist cb712 2 iron tweeked to 16 deg - Project X 6.5 rifle shaft
Titleist cb 712 4-pw - Project X 6.5 rifle shafts
Titleist Vokey 52, 58 wedges - Project X 6.5 rifle shafts
Taylormade Spider Monza Putter - knackered but irreplaceable.