I've met many decent people who work at ThoughtWorks, so it pains me to say this, but based off the interactions I've had with the organization professionally I've started to ask in interviews if the company does any work with TW (and a couple other firms, Pivotal has a poor track record as well). If so, the conversation usually ends there unless it's followed by a qualifier where the interviewer understands my reticence. I've been at two companies where TW involvement torpedoed projects, the culture, and even a sound business model. Not again.
This is interesting, as both these companies have high reputations and at times low reputations depending on your perspective. All consulting companies have their mix of failures and successes. Is this a correlation/causation thing, or do you truly think Pivotal or TW do something uniquely horrible to companies?
( I work for Pivotal but not Labs and am curious. )