I love this little pen! It is similar in size to the Parker Jotter, but I find it more comfortable to hold. The pen has superb balance thanks to the metall nose cone. The pen uses a clever mechanism for preventing tip wobble. The lanyard hole is very useful, making the pen ideal for work, especially fieldwork. The Acro refill writes perfectly, as expected. I generally prefer a 0.7, but the 0.5 is perfectly serviceable, so I'm keeping it for now. The refill is compatible with a variety of multi pens, so it should be easy to find.
