Well, from the few months i have followed mass, it is a very good project; and its mining system is atleast 50% valuable and worth it; but it does not get the hypes it deserves; hence the price has always been low range just like ripple. The most it has progressed in price has been from 0.3$ to 0.45$; its not the best investment choice on the long run.
I implore you to do the best of research duties; and also ensure to invest right.
AFAIK its ATH was 0.7 USD. Even current price of 0.3$ is much better then many other altcoins. Due to its high price on exchnage its mining complexity has increased also. I wish I can go back in time and mine MASS when it was not on exchnage and complexity was too low.
MASS is taking its time and soon it will be a top hit.