Definitely spend time with them. You need to know what type of person they really are and that takes time. Watch how they treat your receptionist or answer a call, meet them for coffee or a brunch and see how they treat wait staff. Let them talk.

If you want an objective measuring tool, i love the DISC system. We offer a very indepth reporting tool than can measure one's communication styles (pros and cons), behaviors and motivators, AND we can assess their sales acumen. We offer a very detailed narrative report, as well as an optional debrief and deep dive on that individual (often used for incumbents to step up their game). I'm happy to discuss and offer a discount of the DISC assesssment per the cost of the Clarity call so that you aren't out additional funds learning about it.