Should you do it?
For $50 I now have a rear shock that works. My stock shock was harsh, and would cause clunking sounds when hitting bumps. The new shock really smoothed the bike out and it seems to handle better since the bike is not bouncing over bumps. I am also using a lot of compression and reboud on the new shock, but it still rides very good. I got up to 120mph going through some light S-curves and the bike tracked great.
Also raised the rear, so I am sure that helped with the handling. Bike no longer feels like a big pig.
From what I have heard this applies to '03 and newer 1000 shocks.