What's the promotion system like in the USAR/ARNG?

My ETS date is not too far from coming (July 2015) and I have no intentions on re-enlisting as Active Duty and I do have intentions on going into the Reserves or National Guard so I can finish the 20 years (retire) and I can also finish college. I was just wondering what the promotion system is like - is it different from Reserves and National Guard or is it the same? I don't have plans to stay in Kansas, I have very good incentive to move to Washington State and join the Reserves or NG there. So insight would be very helpful seeing how my other resources cannot give me any straight answers.