Be conscientious with how you treat it. Get into good habits like:
1. Always wait until the car goes to sleep (the pink likes on the PRND pyramid go out) before plugging it in. I do a quick walk around with Detail Spray cleaner looking for spots to clean while I wait. If you have the 520 software update, that's only 45 seconds. Older software is 2 minutes.
2. When you start the car, don't be in a rush. Get in, foot on brake, press start, then put on seat belt (to occupy a little time) and wait for the "boot process" to complete and all the dash shows you the amount of charge & gas and stops changing before you press Accept on the screen or try to put it in gear. Always unplug the car before you wake it up (which includes unlocking it).
3. Always use your parking brake before you take your foot off the brake in Park. It can help your splines last longer. (Supposedly a future software update will do this for you.)
These processes will prevent some of the possible (though sporadic) funny behaviors of the Karma like fans coming on while you charge, or the charger kicking off. (BTW if it's really hot, a cooling fan will come on while charging and that's normal.)
If the car does anything odd. Let it go to sleep, then open your door, and then try starting it again. If that doesn't fix it, there's a black plug on the passenger side wall under the hood that is the main 12v battery connector. Unplug that for 30 seconds and plug it back in (that's a hard reset). And, try again. If that doesn't fix it, you'll need a CSP.
Also, I recommend getting a OBDLink unit that bluetooths to your phone. The car can generate Check Engine Lights, and you can see the codes with the unit and clear them. A frequent issue is that the battery might have a cell that's acting weakly. That won't keep you from driving and enjoying most of your 50 stealth miles, but your Stealth miles might drop from 8 to 0 in about a block. This is annoying but not critical, and the dang CEL light will block your digital speedometer. It's nice to be able to clear some of these codes on your own and get the speedo back if the car keeps reporting the same codes and your light keeps coming on ... assuming you & your CSP know what the problem is and you are just waiting to fix it.
Search these forums. And, post a question if you don't find your problem already. Everybody is ready to help and give you their advice and experience. Listen closely to FiskerPhilly & Harleyguy. They're actual CSP's and they've been helping us all for years.