Zendesk Sell is essentially Salesforce with an updated design. The software is not designed to be easy to use nor does it accelerate a sales teams ability. If you want a CRM software that take days to set up and not month, LeadLoft is the CRM your team needs.
Sell gives reps access to integrated tools that provide the full context of a customer account. This keeps them in the loop and allows them to capitalize on opportunities. For example, when a support ticket turns into questions about new products, the lead can be handed off to sales. Keeping track is easy because data capture is automated, so reps and agents can stay on the same page.