Pros
Think|Stack has some amazing people. Very smart, very talented, very driven people. Their overall process management and client interactions are amazing. The non-leadership team always have each others' backs and most people will go to any length to help you when you need it. You can ask for help and get it almost instantly on anything you need.
Cons
The problem is that unless you have a real title, you aren't one of the ones that get taken care of. The org is lopsided, in that they have more "titled" employees (VP's Directors, etc.) than actual technical folks who bring in the money. Also, the money that is brought in is absolutely NOT reinvested in the folks who make it. Think|Stack's salary offerings are heinously low for the industry (sometimes as much as HALF what industry averages are). The leadership team frequently goes on outings or retreats that are pretty lavish vacations thinly veiled as meetings. Any concerns on operations are discouraged from being voiced anywhere aside from closed door one on one meetings, with disciplinary actions threatened for anyone who dares voice concerns out loud. Because of the org imbalance, the strain on technical staff becomes larger all the time. Many stellar employees have left rather than deal with the issues that never seem to be rectified. Think|Stack has this idea that they want to hire inexperienced people and train them up, but this causes an issue wherein high level projects miss deadlines and suffer because they don't have experienced professionals to work on them. That and the experienced staff they do have spend more time either hand holding new people or working on entry level issues rather than higher level tasks.