The catch with this one is it won't handle anything much thicker than 5 cP, so if you're working with a highly viscous peptide blend, you'll want to check your formulation first, but for standard GLP-1 solutions it's actually pretty relaible.
Most buyers go with the 3ml cartridge setup because of that it's what they already have on hand, and the auto dose adjustment form 0.01ml up to 0.75ml gives you that fine control without having to fiddle with a dial every time — the visual and auditory feedback basically confirms the shot is done.
It's roughly 25 grams and 161 millimeters long, so it's not going to feel heavy in hand, and injection completes in under 6 seconds, which is faster than some manual pens we've seen, though the ±2% precision is tighter tolerance than most standard injectors for this price point.
The needle compatiblity covers 31G or 32G, which is pretty standard for subcutaneous work, and we usually stock these in sterile packging with a 24-month shelf life at room tempearture (no refrigeration needed, which saves hassle).
One thing we've noticed handling these is the auto mechanism doesn't jam easily even after about 50 units or so of use, but it's not suited for repeated multi-user scenarios since the cartridge is single-use only.