I thought I'd post this up as there appear to be a few fountain pen users here on the forum.
TWSBI Mini Classic Fine arrived arrived from the Writing Desk this morning. I have loaded it up with Noodlers Black Swan In Australian Roses and given it a quick try. In addition here are some photo's though the light is pretty non existent here at present. So my apologies that they are not to standard
It writes very nicely, though I find the nib a lot firmer than my previous TWSBI which was a 540 ROC 100. The ROC had much more flex although not an actual flex nib. As well as being shorter it is thinner than the 540, but not too thin for me.
You can write with it unposted ok but posted it really is a joy to use. I have shown it alongside my Rotring Lissabon which was to hand.