Earlier today Lexikaliker published a blog post about uni-ball’s Jetstream. Have a look, his Slim Compact looks really good.
One detail is rather curious. He never experienced line variation issues with his Jetstream pens whereas I regularly experience these issues with all my five Jetstreams. This makes me think that this is not a one-off quality control issue. Instead, it might have to do with writing pressure or writing angle (The latter seems more likely, just because I assume my writing angle deviates more from the average Jetstream user than my writing pressure).
Have a look at the two ‘e’s and the ‘y’ in the example below.