I would ask that colleague to first and think about what exactly they use their social conversation for. Do they run Twitter contests? Are they asking users to RT posts in order to win a prize? Sprout social is invaluable for that sort of conversation, so they should consider whether they'll be partaking in a lot of social endeavors where they are listening for specific conversation. I would also want them to consider the size of their company as well as the size of their social network. If they are approx. <5,000 Twitter followers (or something similar, depending on their in industry), the may not need the tool quite yet and can probably manage until they've grown a bit more. However, if they have the resources at their company, I would say then purchase the product regardless of size.