Here's the way it seems to work for many people...
1. Read all the glowing reports about X3.
2. Take the leap of faith and install X3.
3. Become incredibly frustrated because the workflow is so different.
4. Wish you'd
never installed X3.
5. [optional] Come into the forum and rail about how much X3 sucks.
6. Start discovering things about X3 that are cool.
7. Discover more things about X3 that are really cool.
8. Start to realize it's taking you less time to complete projects, and you're having more fun doing it.
9. Wish you'd upgraded sooner.
X3 isn't as customizable, has a definite learning curve if you're used to 8.X, and you have to unlearn everything you knew about comping and layers so you can learn how X3 does it. But there are so many workflow improvements in the X-series...it takes a while master them, but it's well worth the effort. It's like you have to make an investment that doesn't seem to pay off at first, but then really pays off over time.