Pros
The client list is fantastic and will help your resume stand out. If you have a self-motivated and -driven disposition, then you'll do well. If you want to do great, creative, innovative work, it's totally possible, but it's on you to see it happen. New ideas are encouraged and supported.
Monthly parties and birthday events are fun for taking a break and socializing with colleagues. Very casual atmosphere. The staff is open and friendly.
Cons
While you can definitely come up with incredible tech and creative ideas, don't expect a lot of infrastructural support in accomplishing your goals. Management doesn't have the technical know-how to innovate and is unwilling to invest in the right people to do the job. The processes that govern the organization are loose, disorganized, and unclear. The hierarchy in the company is a tangled mess, with almost every manager overlapping each other in responsibility, including the CEO, which means you're often wondering who's actually in charge.
Don't expect to grow in your role. Training is sparse, with the company relying on a "learn it yourself" model. Very few opportunities to attend learning workshops. Salaries seem to below market rate, and the benefits are mediocre at best, which means very few talented people remain for long, leaving only a collective group of timecard punchers. The company doesn't seem to know exactly where it's going, as many big-picture ideas were formed during my time, only to die on the vine.