They are trying to impress the US Gov right now big time.
The fear may be unfounded though.
Ill check them out
I have heard stories like this too many times:
http://www.reddit.com/r/CoinBase/comments/32k95v/coinbase_is_canceling_my_ordersagain/
http://www.reddit.com/r/CoinBase/comments/2zho6z/fyi_it_took_5_days_for_support_to_respond/
http://www.reddit.com/r/CoinBase/comments/2y76yu/stay_away_from_coinbase/
http://www.reddit.com/r/CoinBase/comments/339jma/a_year_later_no_resolution/
Also there is this guy:
https://twitter.com/Coinbase_Victim
Some interesting information didn't think it would start happening that quickly.