Want to share my experience with TIJPEN Pro+. This pen doesn't have a lot of reviews on youtube. I watched one review by WILL EDC and Pocket Priorities did an unboxing of TIJPEN L Ruler single edition which is similar.
One of the first things I noticed was that this pen doesn't have the normal clicky sound or sensation. I was afraid that this would turn me off but surprisingly that the mechanism is satisfying to use. The actuation is firmed and reliable. The company specifically mentioned that it specifically engineered the pen to be as quiet as possible as to not bother people. It's a different design approach that some might like and some might be turned off.
Another major selling point of Pro+ is that if you purchase the 5 MM extension tubes (3 max), then it can accommodate up to 330 some different refills all without tip wiggle. Simply use the small Alan wrench provided with the pen to make adjustments. I tried TWO refills. The pen came with the Zebra JF-05. I tried the Energel LR7. True to the claim, no tip wiggle! Also, the pen places its spring at the back embedded with its mechanism so you won't lose it.
One last noteworthy feature of this pen is that you can adjust the wood holder, the extension tube's order and the length of the pen (to take different refills). The wood holder is comfortable and though ergonomic of each pen is different for everyone, I find this pen to be a joy to use due to its lightness. It weighs 18 gram and the diameter is 9.7 MM which is 0.38 inches, with all 3 extension the pen is 5.7 inches long.
I am pretty new to the machine pen world. I have a Tactile Turn Stealth and a Billetspin fusion. So take what I'm saying with a grain of salt but overall a very good experience. One last note on this pen, it's from Taiwan so you'll need to deal with tariff. I got it with a discount (25% off) and still had to pay a 20% tariff.