Pros
SHI has great leadership and tremendous resources. You're given ample opportunity to build your business and have a wealth of internal technical contacts to support your efforts. As a large (and still growing) reseller, SHI is committed to getting to the top and bringing its top contributors with them. The culture is second to none, and they make sure to embody the "work hard, play hard" mantra at every possible opportunity.
Cons
Large size and rapid growth can often lead to growing pains. In SHI's case, the challenge falls to the sales managers and reps to ensure that growth quotas are met despite changing focus and shifting resources. I would say that the only drawback to SHI as a whole is that their business system is still very dynamic and not fully developed. Give them time, and they'll be unstoppable. From a field perspective, the technical resources available are limited (again as a result of rapid growth).