We commissioned Xenogenix to spend 3 days at our office in order to understand our business and map our processes into our 2 year old Salesforce implementation. I was very impressed with how Xenogenix got under the skin of our organisation and posed leading questions to get what we needed into Salesforce. Their understanding of Salesforce is as you'd expect first class.
I'd thoroughly recommend Xenogenix to anyone who wants to get more out of their Salesforce CRM.