I'm planning a guided attempt of Aconcagua with one other person. We've looked into several of the available companies and are now intending to go with ACOMARA - Aconcagua Expeditions. Has anyone used them as a guide service and can you provide feedback either positive or negative? Any input or suggestions would be greatly appreciated.

I made the Aconcagua summit in January 2011 with 3 friends. We hired an expedition to Acomara - AconcaguaExpeditions.com and I have to say it was perfect. Our ascent was by the normal route and our guides took us to the north summit1962 m. I am able to recommend Acomara AconcaguaExpeditions is a responsible company with excellent staff.
I hope you can complete the dream of climbing Mount Aconcagua. That's incredible. Regards.