I have a number -
101 special (eyedropper) Fine steel nib - holds a whole heap of ink - works well.
MB cartridge filler with silver coloured "iridium Point Germany Nib" - It was a terrible nib and I reground it to a sharp italic.
162 piston filler with gold coloured "iridium point" nib - works well. I reserve this for bright red inks, as it has a bright red barrel and cap.
They are made of low grade plastic, but they have ebonite feeds, so they flow better than many plastic feed pens.
I also have a Camlin 22R eyedropper with steel Ambitious nib - works well; and one of the new Dilli piston filler pens with a fine RH oblique stub nib. This is the finest oblique stub nib I have and it gives a certain flare to the writing because of the reverse oblique, despite being a fine nib - it is fun. The only problem with this pen is that the piston twist cap has cracked - and it was the dearest of the lot at $18.
They are very low cost pens; I bought all of mine from Fountain Pen Revolution (in fact two of them were freebies with other purchases); FPR customer service is hard to beat; Kevin offers a choice of nib selection and supplies one of the two modern flex nibs that are available today (I swapped mine out - I can't flex!); many of the nibs on these pens are no.5 press fit nibs that can be replaced by other brand nibs (be careful, though, some can't).