I'm not a HP pilot but I used to work for TACA in El Salvador, as far as I know HP have been using AEROMAN services since 2004, they perform some major checks and they also give maintenance for Jetblue.
I haven't heard about any problem or incident related to the maintenance given by AEROMAN, but I've been living here in the states since 2005 so unless someone else knows something new I wouldn't be that worry about it.

Just my .02 cents.