I calculated (figuring difficulty) that it was worth getting the several months of good dividends at the price I bought the shares at. Honestly, I think we have several good months left on this. You can do the math yourself for the current price (BTC0.00365, I think)...

According to profile on bitfunder...

D is the current difficulty
H is your hash rate in Mhash/s = 1 MH
B is the current block reward in BTC = 25 btc
(H*B/D) * (60*60*24 * 65535 * 10^6 / 2^48)

(1*25/26162875.68257) * (60*60*24 * 65535 * 10000000 / 281474976710656)