I've only had bad experiences with Parker pens and refills, they just don't flow and fill the line as nicely and constantly as Pilot Hi-Tec and other Pilot pens.
I paid more than 20€ for a Parker pen with refills and it was worse than a 3€ Pilot V5 Hi-Tecpoint (which is my current favourite, I have it in black, red, green, blue and pink colours).