I loved being an IMA...less work and more flexibility. My position allowed me to keep my flight pay without the headaches of trying to stay current or do mobility requirements. CBT's are your biggest headache...wait, that's everyone's headache.
If all you're trying to do is maintain enough points to get to retirement. Occasionally get on MPA orders and have control of your life...IMA is a great option.
Downfall, you have to be smart on taking care of yourself. Our support is regionalized. It's a great option.