Which CRM for field based staff?

[EirSurvey]

I'm looking for some feedback on which CRM system is most widely used by small businesses to support field based workers.

I suspect SugarCRM would be right up there but I'm sure there are plenty of others.

I'm particularly interested in what systems are used to support field based workers as I'm looking to roll out a mobile based app to connect these workers to whatever CRM system they currently use.

[essentialed]

We use Sugar but I don't like it much. We are a few updates behind and that may be part of it, but it is a clunky thing and the search never seems to work right for me. I was at another company that bastardized Salesforce.com and if they hadn't "customized" it so much it probably would have been fine.