Very strong team culture. Ability to participate on a wide range of quality projects. Strong leadership and an unusual amount of corporate transparency.
The firm caps at 30 people even though they could certainly grow, which is indicative of the fact that the principals want to keep the team nimble and producing good architecture as opposed to growing for the sake of cashflow.
Inconvénients
None really, other than the disadvantages that might come by default, with this scale of practice.