Vantaggi
They have impressive presence around the world. They have inherited benefit from Microsoft and Accenture which turn bad sometime.. read Cons. They have some really good talent at work in case of Europe and US, India.
Svantaggi
In Short i will explain my story : They get hired me from all the way from India for a crucial job as they are in trouble with Sitecore Project. They offered me a permanent role upfront as nobody will come and join on contract basis on more experience level. Whole experience in project is like hell as Project is run by the Accenture, Avanade provide only resourcing and have no control over project. Accenture know little about the technology but they know sure about money and time. They keep extending my probation until one day when they suddenly decide to drop me on basis of my consultancy skils (Bu**s**t) as they can't question the work i have done and skills i have technically. So the original game plan is to hire a senior resource a short term and once project is finish and if they don't have any other Sitecore project parallel then kick him out. The moral of story is they too short minded and not have any vision like building competency or have patience. They only work on principal of resourcing and billability of day to day basis. They can fire you anytime. There whole business revolves around the accenture business means they don't have substantive business of there own so Accenture guys are real boss. Don't join them until you have solid vision for you defined by them.