Sturdy? Yes. Reliable? Yes. But I have two issues with this pen.
1) I hate the click mechanism because if you grip too high up the pen you will compress the spring while writing. Now, I don’t always write like that but when I’m using a pen to quickly jot notes, sometimes I don’t grip it as properly and so this becomes annoying. The click is also rather unsatisfying so if you wanna fidget with this pen your best bet is unscrewing and rescrewing the body of the pen, because the click is kinda disappointing.
2) I don’t trust this pen. I have yet to have a leak in my pocket, but because of the nature of the design of this pen I’m worried it’ll get clicked open when I put the pocket clip on my pants pocket and an hour later I’ll discover a mess. I’ve yet to have that issue, but a traditional click pen design would seem more trustworthy. I don’t like that the pocket clip is on the moving part of the pen.
Overall? Solid pen. Has always written reliably when I need it. The body of the pen has a satisfying weight and the threads are neatly cut and it screws together very precisely. It’s a rather small pen so if you have a big hands that might be an issue but if you want a small pen? This is a great inexpensive option. This has become my new edc pen and goes everywhere with me. I don’t know if it’s fair to call it a “tactical” pen because it doesn’t have much grip and there’s no fixed point to use for self defense, but I’m confident that the metal body of this pen is at least sturdy enough to push into someone’s pressure point, should I be forced into a situation where I had to use it for self defense. But if you want a pen that definitely fit for self defense don’t get this, but this might be better than defending yourself with your bare hands.
All in all, a solidly built reliable pen.