Don't let the grip shape scare you off, you might like it more than you thought, but if not it won't ruin the value as an experimentation platform. Note that unlike a ballpoint you'll need to experiment to find the right combination of nibs, inks, and papers.
Also check out the unrelated free Handwriting Repair pdf so you don't feel ashamed and disappointed in yourself every time you use the pen. Plus it'll turn the flat shape of the nib into an advantage.
Edit: People seem to like the Pilots. I haven't tried them, but they seem to also be inexpensive and have good nib and ink options.