Lanxivi Penbbs 268 Vacuum Filling Fountain Pen - Medium Nib Clear Acrylic Collection Pen with Gift Box | Premium Writing Instrument for Calligraphy, Journaling & Office Use

I've had this pen for about 2 months, and it's quickly become my go-to daily writer. It can fully disassemble, which makes cleaning and greasing a breeze. It is a full demonstrator style pen, so whatever ink you choose will dramatically change the appearance. I personally like the sloshing effect I get with the Pilot Iroshizuku ink line.The nib is surprisingly smooth and wet. I would consider the line thickness closer to a medium than a fine. It does reverse write well, bringing the line thickness between an extra-fine to a fine. The nib is nicely engraved with ornate lines and the words "PEN BBS Since 2005 F." Unfortunately the nib has very little flex, but it is a standard size nib and I have seen videos of people swapping them out for their preferred brand. Word of caution - those who have swapped out the nibs all recommend taking extra care as the feed's ribs are very fragile.The filling mechanism is what makes this pen stand out, especially as a demonstrator. It is very efficient, with a lot of back pressure as you approach the bottom of the down-stroke. It was clearly built to a fine level of tolerance, which is truly impressive at this price-range. Without any tricks, I can easily get a 2/3 fill with 1 stroke. Also there is a small chamber between the feed and the barrel that holds ink for short writing sessions, see picture. If you find it running dry, you can unscrew the back cap to open up the ink flow. This same feature also acts as a seal to prevent ink leaking during air travel.My only small critique is that a wrench is not included, which is needed to remove the filling mechanism from the back of the pen. Companies such as TWSBI will provide a wrench with the pen to help with disassembly. With that being said, this pen does come in at under half the cost of the TWSBI vac-fillers, and you can find the right size wrench at any local hardware store.