STEEM power is a long term move. It increases your ability to receive income for your site activity, and gives you some passive income. The only "issue" is that in order to turn it into tradeable currency or cash you have to convert it to STEEM over a 13 week schedule taking 1/13th per week. So I'd say it's a good long term move if your goal is to get more STEEM now, and not worry about getting cash until later.