$ 2,795.00 for 6 GH FPGA? Hmmm $ 7,000.00 for 250 GH ASIC(?) seems much better deal...
Where did they say the $2795 for 6 GH?
Its on the web site.
How quickly will this pay for itself?
You make ~$50 a day today with 6GH. So, starting today, it would pay off in 2 months. However, difficulty and exchange rate will not stay the same during that time period. Make your own assumptions.