Pros
Leostream is a working environment unlike any other. The work/life balance and overall flexibility is unmatched. No dress code, days off and holidays as you need them, flexible working hours and ability to work from home basically whenever. As long as you are generating the results expected of you, no one really cares how you get it done. This environment is perfect for someone like me, who basically hates being told what to do. I decide how to best spend my time each day and I know my ideas and contributions are heard and taken seriously. Also, they just opened up an office in Chinatown, which is an easy commute if you live near a commuter rail (like me!). They are flexible if you want to work out of Chinatown or Waltham though.
Cons
Like a past reviewer said, not everyone can cut it at Leostream. Don't mistake the lack of rules for a lazy environment. You are expected to be able work independently and have enough self-discipline to do your job without a manager breathing down your neck. If you can't, they are quick to cut dead weight.