I rode for 1000 miles with no center stand and have 5000 miles with center stand. I have noticed NO difference in dirt or much accumulating anywhere and I've driven in some nasty stuff both before and after.
Besides the fact that I can now park in soft gravel, clean my wheels much more easily, remove the wheels more easily, I've also noticed another benefit. If you ever just want to sit in your garage and stare at your wonderful bike, it's much more enjoyable to stare at her and appreciate her beauty when the bike is on its center stand. When leaned, you can't really ponder her well on the left side because of the angle.
No clearance issues. It was $235 installed. I tried for an entire day to get that spring hooked up and ended up with bruised pride and several cut and bruised fingers. Kudos to you guys that were able to do it yourself, I wished I could have seen how you did it.