Hello, I have several Bock #8 nibs. They are all quite nice but each has different characteristics.
I wrote a bit on my website, and I've attached my writing sample below. Some of my impressions have changed slightly now that I've used them in my Conid King Size for some months now.
#8 Gold Fine and Medium: Mine were very wet, and of course pretty soft. I had to tinker with them a bit to get the flow and feel the way I want. At first the Medium was very flexible. Too much for my needs so I re-seated the nib and pressed the tines together a bit. I still don't use the medium that much because it is a little too broad and wet for my taste. If you have experience with the temperamental Pelikan M1000 nibs, then you'll understand a bit about these #8 Bock gold. (But Pelikan is much more soft and bouncy.)
The fine gold is my preference of the two gold --it writes quite well and the line width is more what I was looking for.
#8 Titanium Fine and Broad: The broad, for some reason, is bouncier and more flexible than the fine. I rather like it, though it was over polished and had skipping issues that I fixed with some simple grinding.
In my experience with both #6 and #8 Bock titanium nibs, the #6 are very flexible but the #8 is not as much. Meaning the #6 borders on being a "flex nib" by some standards. I find the #8 to be fairly soft, but not proportionally flexible to the #6.
The fine titanium is very nice, but stiffer than the broad for some reason. It is stiff enough that I would say that the feel is closer to steel than to gold. I don't know why --maybe just a different batch of nibs as the tipping size has no bearing on how much the tines flex. The fine was a tiny bit dry, but that's easy to fix.
All of that said, if I did it all over again and could only choose one nib, I would choose the titanium fine because it was the least temperamental and I tend to write a bit hard. So it's probably my choice for all-around writing.
If you can, perhaps get a couple of titanium nibs to try out. They aren't as expensive as gold, and you increase your chances of getting something you like.Better to get the pen writing just the way you want it and have an extra nib lying around as opposed to getting the pen and you keep wondering if there's a better nib for you. That's what I did, hence all the Bock nibs in my collection. (Plus I like to tinker and try different things all the time ...)
Here is my writing sample almost immediately after I got the nibs. Keep in mind that I find this particular ink to be extra-wet (Noodlers Bernanke), so these writing samples may vary if you use a drier ink and/or a different type of paper like Rhodia.