Hrmm how about any problems with the drilling and extracting the oil (physical problems)? And also potential cost blow-outs and effect on cash-flow? ie. further capital needed.
I guess the strike rates of AOI are a good sign, plus the experience of Tullow (Kenya) is also handy too.
Also, what is lookandsee's bread oven can fit this huge loaf that has been rising on the kitchen bench? :)