What is great is they can use other reaction mass than Xenon, which is very rare. And if it's a solid right in the electrode, it's potentially very easy to stor

What is great is they can use other reaction mass than Xenon, which is very rare. And if it's a solid right in the electrode, it's potentially very easy to store. Probably limits total mass though so maybe use it for very low acceleration missions where you can use the high isp. Like stationkeeping indeed.