What do you think of these pens? Also, can the nibs be changed if necessary?

[aggeilon]

Hello, for my second pen I'm thinking about getting a wooden one, and i've seen some unbranded bamboo pens that look pretty nice on eBay..


Also, I'm still considering this one, it's a kind of an obscure brand but I like its aethestics (Schmidt nibs):
http://www.shop.nerocalamis.com/it/1...-stilografiche


But mostly, I'm looking at these ones:
https://www.ebay.it/itm/Bobby-B4-Gre...hpfm:rk:1:pf:0
https://www.ebay.it/itm/1Pcs-Vintage...IAAOSw1ulcTjws
https://www.ebay.it/itm/Bamboo-Black...d=232603315334

The last 2 links should actually sell the very same pen but the colors in the pictures are different some I'm not really sure... anyway, do you think an unbranded pen like that deserves trust?
Also, both bamboo pens use a Hero nib, which is a Chinese brand; if necessary, would I be able to switch them for another nib? Are different nib brands compatible?

[Spants]

There should be a number of nibs that would work for it. Normally it would be a #5 or #6 nib. You can get them from any number of retailers sell them. Generally the nib and feed should just be friction fit so all you would need to do to swap them would be grip the nib and the feed then just pull out then you replace with a new nib and then put it in. Sometimes nibs and feeds are screw fit but I myself have never heard of one on a Chinese made pen.

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[Runnin_Ute]

I have a couple of pens with Schmidt nibs and they are quality nibs. On a par with Bock and Jowo nibs.

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[aquafox]

Nero Calamis is a 65€ kit pen... Just no.
There are better options around, really.

Bobby's pens are good, but I would be wary of that huge step down.

[pajaro]

You don't want to know.