Sierra is a nice piece of hardware from current point of view.
However I'd say it depends on the point in time of final delivery, what KnC offers begin of next year and how cointerra does..
Jupiter customers from day1/2 have until today ~50% of their investment back in pockets (from fiat view point, only).
So it might work out if you are one of the early birds taking a high risk, but for later ones the margin gets smaller and smaller.
Keep in mind a 'money printing' machine attracts greedy ones from all sides, stupid ones as well - I saw on ebay mid of September 7 bids for old avalon 160GH/s, $11.9xx
It seems impossible to count on fast delivery of any ASIC products lately from the response on the forums.
Very true (about the greedy folks).
Also on a side note, has anyone used the calculator on
http://mining.thegenesisblock.com/ ? It has a spot to input "conversion increase %" - I assume thats the price BTC goes up in value each month. Hard to estimate this, but I've read folks think $300 by Jan 2014 - so 50% rice might be a good guess no?
Thanks for the responses guys.
You should leave the conversion % increase at 0 because if the mining equipment isn't going to ROI in BTC terms then what is the point of going through the trouble of mining when you could have just bought BTC.