It was handy as it was just across the street from my hotel ( Leifr Eriksson). I attended an organ recital there and visited again during my week stay.
The view from the tower is not overly spectacular though that may depend on how clear the weather / views are.
Very nice to pop in and just take a seat and ..............relax.
It is free to go in, but costs (unsurprisingly) to go up to the tower.