This review is only for the pen body, as I did not buy a nib with the pen. The body of the pen feels well made, the threads are nicely made and the converter works well. I swapped in a pilot parallel 1.5mm nib and it works perfectly, no leaking or burping. This pen also looks like it could be eye droppered pretty easily. Very good value.
For the parallel nib swap: Simply insert the parallel nib into the section. It will take a little force (but not much). Then fill the pen using whatever method you like. It feels like there is enough room for the larger parallel nibs as well. Very good alternative than spending 100+ for an Opus 88 for nib swapping.