Pros
Unlike many other consulting firms, Summit places real emphasis on work-life balance. The billable hour requirement is reasonable, and most managers are understanding, flexible, and considerate regarding work demands for lower-level staff. Summit's "personality" is another strong point. Summit is able to balance high productivity with an easy-going, low-stress environment. This is possible because employees like their coworkers and managers, instead of fearing them. There are certainly exceptions to this rule, but this is generally the case.
Cons
The base pay seems lower than comparable statistical consulting firms. This is explained, I believe, by the favorable work-life balance Summit offers. Further, bonuses in the past had been generous, which was great, but they have been reduced considerably.