I am officially mining bitcoin!!! 
Hm, is it still profitable? Just canceled my BFL order, bastards....
i don't have a clue!
in 2 years when the contacts are done, ill let you know
my guess, i'll get the $ value i put into it for sure, no problem, but i paid in BTC... I should of held my BTC but i could not resist the numbers, at the time ( when mining difficulty had just started to rise ) it seemed like i was going to double or even triple my BTC ( even considering that dif would keep going up) , so i figured difficulty can not go up that much more then I estimate and i would at least get 110% of my invested BTC back, and so i bought like a mad fool.
difficulty rose way WAY higher / faster than i anticipated, and now i'm holding contracts that are likely not going to make half the BTC i put in...
You can figure it out. Take the hashing rate of the contract you purchased in hashes/sec divide it by the current difficulty and multiply by 0.013064576229
The result is the number of Bitcoins you will ever make based on the current rate of difficulty rise. The cost of electricity is not a consideration in this calculation.
Take care
I wouldn't say this is a good way... The bolded assumption almost certainly not going to hold over the course of 6 months, let alone 2 years.
You'd have to calculate different scenarios of difficulty growth.
