In full transparency I worked for OptionsHouse on the IT side for just over a year. I found this to be a tough review to write because from the folks I worked with at the mid-level management to individual contributor perspective, they actual had/have great talent. In fact, since I've left the firm, I've tried to poach a few as a testament to said talent.
However there is no denying there is something fundamentally wrong with this place. The turnover is shockingly high and don't think this is all driven from people leaving on their own accord. More than a large handful of times, in my short year with the company, there would be firings/ layoffs, many times more than one person at a time. In fact it got so bad, on Fridays people would be looking over their shoulder for tap to go talk to a manager and HR person and then they were gone come Monday morning.
Within the IT department I found the leadership very unwilling to introduce newer and efficient processes. One meeting in particular I tried to convince the testing lead of doing things a different, and what many in the industry consider more modern approach to software development and test, only to be asked before I could even start... 'why do you feel like we're so terrible at our jobs'. This is not the best way to start a meeting where you intend to collaborate, however I feel sums up my entire experience perfectly. Layer on top of that the rampant 'nepotism' 10,000lbs gorilla hanging over the place... At some point you get tired of beating your head against the wall and seek out a firm where you feel like they are willing to change and innovate fairly.
All in all I would pass on this firm until there is enough evidence that things have truly changed for the better.