Thanks for your input guys. I guess I'm hopeing for a bit more like, Will the compression adjustment help the nose heavy 1200 from diving into big holes or is this just a function of the front shocks. Can you use the compression adjustment to keep the shock from bottoming while still keeping the spring fairly soft to give a better ride? Again not sure how the shock works in the center position so am probably asking dumb questions. My basic concern is , if I can improve the ride with a better shock then its probably worth it, but if the gain is not really noticeable than perhaps $600 is better saved. For example the Twisted Springs I put on last year were truly amazing on the effect it had on ride quality of the frontend, Perhaps I just need to try it and experience the change for myself but like I said all these things are a bit pricey
You can revalve the center shock to work just fine. Have you ever experienced shock fade?
Running into shock fade after a 'few miles' IMO is an exaggeration, no offense to anyone. Most people can't/don't ride hard enough to experience shock fade. Not saying it doesn't happen, it just takes a LOT more than a few miles to happen.
The shock fade is going to depend upon the quality of the oil that is used on how long it takes to break down. Cheaper oil is going to break down sooner than a good synthetic. It may happen somewhat sooner on a 1200 than an 800 2-stroke. It will definately happen sooner on a center shock than all the other as it has the smallest amount and takes the most abuse.
Even a Pro-40 center shock will break down sooner than the other 3. They have about 3/5ths the oil the rest do. So even it will break down sooner than the other three.
If you have not experienced shock fade then revalving your current shock would be a good option. If you experience a lot of shock fading, the money would be wise.
I have riden 250-300 mile days on Wisconsin trails using shocks with 1000 miles and they got a bit soft on the studders but anything short of that and they were fine.
Pro40 shocks are really nice shocks. Axis shocks are really nice shocks....but most people cannot ride to their full potential. Kind of like having a Porsche 911 for a city commute. Nice car, but you will never be able to drive it to its potential.
If cost is an issue. I would opt to revalve your current shock, install a good set of dual rate springs and see how you like it. If you experience shock fade, you can then opt to upgrade the center shock. You can ALWAYS sell a good rebuilable center shock for the cost of set of dual rate springs. Since you already have the rebuilable center shock, If you sell the setup for the cost of the spring you are a wash on price and you will know if really need that shock or not. Used Pro40's are becoming more available and lowering on used prices.
Just some thoughts I share with my shock customers when they ask me the same questions.