As with any helicopter it depends. Let me give you two scenarios.
I have a friend who had a A109AII for personal use a couple of years ago. He bought it because, as a twin, it had a low capital price. He flew it for an hour or two a week. Half the time that it was on the ground, it was sat outside in the cold, damp rain. He moaned, bitterly that when he came to fly it, it was unreliable. It cost him a fortune to operate on an hourly basis. He says he was paying for a days unscheduled maintenance every week. His techlog was full of defferred defects. The gear rarely worked. He survived a year with it, then sold it.
I also know of a very succesful operation that has several A109A's & II's. They fly them every day, always hangar them in a beautiful hangar, have a team of dedicated engineers who pamper the machines. They swear by them, have operated then for almost twenty years.
Get the picture.