I have four of these pens that I bought from JetPens and every one has cracked. The cracks radiate around the barrel starting at the threads. With judicious application of some light silicone grease, ink leakage is minimal. The scratchiness of the ballpoint smoothes out after a while. I found that by writing on paper such as stone paper, it helps smooth the pen faster. As disappointed as I am in these pens, I would not buy another one. I have had better luck with similarly designed $1 pens from Ebay.
zhanggooThe Visconti Rembrandt Eco Roller is one of my favorites as is the Lamy Safari Rollerball pen. If you search for cheap fountain pen cartridge taking rollerball pens on Ebay you will find quite a few. The Kaweco Ice is my favorite fountain pen cartridge rollerball pens and as soon as I find it again will take its proper place in my EDC bag. I have also discovered that a Schmidt PRS Ink Cartridge Rollerball Tip fits several of my fountain pen bodies, converting them to a rollerball for a little more variety.