I have had some experience with Avionco. If anyone wants to discuss, feel free to PM me. I too have heard mixed things about this company. What I do know is that a couple of my friends are working in South America right now and they are being paid like clockwork. They are very happy with the way things are going.
I wouldnt quit my airline job to work for them, but if you were single, furloughed and willing to work in a 3rd world country war zone, this might be for you.
Contract work in itself is inherently more risky than working for a normal Part 121 carrier in the US. You may need to adjust your expectations accordingly. A lot of things could happen in contract work such as not getting paid on time to not getting paid at all. It many cases it really depends who Avionco is contracting with. From what Ive heard, Avionco is looking for 737 pilots and CRJ pilots right now to fill positions in Sudan and Afghanistan.