I recently bought one of these for my first DIY build so I thought I’d give some info, but take my comments with the context that I don’t have anything to compare it to. With that said, I’ve done a good bit of soldering and electronics repairs, disassembly, and I’m just finished an electronic engineering degree so I’m not a complete newbie.
It has four general power settings instead of pulse time control, +1 for ease of use, -1 for transparency/control. I would prefer direct control but for the product that it is it makes sense.
The connectors seem to be good quality (not sure if this is what they mean by “gold deposition process” as a feature of the 1S model vs the 1). Supplied leads are good silicone, 10awg might seem measly but it is only carrying the 100s of amps for a fraction of a second so probably fine. I like the probe contacts, mine have tarnished quite a bit but I think this is from me making sparks because of poor contact.
Battery life is fine, though there is a noticeable difference in power between fully charged and lower battery levels.
It came with some 8mm*0.1mm “nickel” strip that was actually a something ferritic coated with nickel because it rusted when I left it in some salt water to test. For this material, the lower power settings were fine and created strong welds. I used some of this for parallel connections because I didn’t want to waste the nicer stuff and it was narrower than the real nickel I have.
I used it mainly for 0.2mm solid nickel, for which it was just about capable. The pack really needed to be close to fully charged and on the highest power setting, and I used quite a lot of welds (minimum 3 pairs per cell). The welds were generally good, fairly hard to pull apart by hand, but not exceptionally strong. In real use the pack has survived fairly well (outside of some mistakes on my end).