Her stock isn't cheap and if you are on a budget you'll need to kill a couple of dyna bosses or pull a mission with a battle suit as the reward. But since Bernice's stock is in various different QLs, she might be the girl to see if you're after a specific QL.
Note that you can overtune the Tank Armors to remove most of the penalties and provide great protection. The guide can be found here.
Note: Always check the requirements of any item before you purchase it (move cursor over item, hold shift+left click).