I love these types of players, just make sure you have notes on them (and make sure they are doing it with a big range of hands, just because someone is being a lot agressive all the time on a table doesn't mean they are doing it with any two cards, sometimes they are on a good run and having awesome cards) and wait to get a good hand to make the most value out of it, let them be agressive when you do and enjoy they spewing all the chips for you