Pros
Culture in HQ seems to be very positive, but if you are outside sales, the culture diminishes pretty fast. They have a niche market and many of the service member's provide excellent service to customers.
Kontras
The industry is evolving quickly and many customer's are moving to the cloud. With on premise hardware decreasing, this will continue to make the market more competitive and a race to the bottom in pricing. While SEI has a great model with W-2 engineers, this can be a negative tradeoff as they are more expensive than most competitors when essentially providing the same service. They were also recently bought by a new PE firm, which has already negatively impacted quotas with a 40-60% increase and little room to make good commissions unless you absolutely crush your number. They also promote people into Sales Management based on performance, which is not a great practice as you get manager's with sales success, but no idea on how to be productive leader's.