Honestly... I think its a dud, and at best a long term risky investment. Consider this, you invest 5 years worth of registration $35x5 = $175 now, in 5 Years, with luck, what is your expected sales price? $500? Youve made a profit, but it took 5 years to realize an approximate 250% ROI (forgive my numbers if there wrong, just doing math in my head).
Could you invest the same money, make a better return in a shorter period on .com or say a few of the other gTLD's? The answer is yes.
So... my answer is - DROPADOODLEDOO