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Opus88 Omar Clear Demonstrator is one of the latest eyedropper pens from Taiwan based, Opus88 Many reviews have touched on the basics of these popular eyedropper filling mechanism based designs. They drink most any ink and have cornered the market on affordable modern eyedropper mechanism pens with piston shut-off. This is just a quick look at the largest size Omar in a clear demonstrator finish. The Omar is basically the demonstrator model plus a few stylish curved touches.The piston rod pulls out just like other opi/opuses to act as a shut-off from the main ink supply.I've never had one of these pens before and bought it for the looks, filling mechanism and Jowo #6 nib compatibility.Plus it is waay less expensive than a Namiki Emperor or vintage Ban-ei eyedropper with that cool eyedropper mechanism. Size is relative. But the Omar is a non-posting pen and skews to the larger side.I have smaller hands but I found the size very comfortable, more than say a Pilot Custom Urushi I'd put it between a Sailor KOP and Sailor 1911L; just right!! Top to Bottom size comparison: Pilot Custom Urushi, Opus88 Omar Clear, Lamy Safari Vista, Sailor 1911 Large Demonstrator, Aurora 88 Chrome cap, Pilot Kakuno So far the performance is the great standard out of the box, Jowo #6 medium nib: smooth and direct with little feedback using Monteverde Olivine ink I have not tried swapping the steel nib but I do believe that it would be compatible with Jowo #6 nibs on cartridge/converter pens like Franklin-Christoph, Edison Pens, Esterbrook Estie (Kenro), Carolina Pen Company, Ryan Krusac pens, et al.from other videos I think there is a teeny o-ring I need to retain unlike the c/c jowo which does not have one.One negative was the nib was askew from the feed out of the box, but a simple twist set the feed aligned symmetrically with the nib point.Built quality It's plastic and sturdy and clearIt has that plastic on plastic squeak/scratch sound between the threads (I'll probably silicone em up)the powder coated paint black matte clip seems pretty secure I wish more companies were like TWSBI and include extra goodies, as Opus88 could supply back-up o-ringsSummary I'd buy this pen again. It can serve a one pen person admirably. Feels sturdy though light. I like its styling good looks as I did not care for the colored versions of the Omar line.It's Jowo #6 interchangeable swapparoni niboroniIt can contain a good amount of ink as a testbed/sandbox for scary iron galls to shiny shimmery, pigmented (bleep) you cannot use on vintageIt has that cool eyedropper mechanism yet inexpensive enough that you don't break the bank having to finda Ban-ei living national treasure pen restorer in case it breaks.My biggest negative is that it does not POST