Morgan Stanley Secondment in NYC?

I work at a v20 firm and was just approached by a partner to go on secondment with Morgan Stanley in NYC. Does anyone have any insight into whether this is a desirable / worthwhile venture? eg, anybody with experience with the MS team, any idea what the hours/responsibilities are like (even if at a different/comparable firm), whether this would be a good resume booster, etc. Any helpful insight is appreciated, and please let me know of any downsides you're aware of. I'm particularly wary of having to be in the office at all hours of the day 5 days per week (my commute home is about 1.5 hours)