This spot welder is solid. It works great for joining sheet metal to sheet metal, and after a few test shots of welding sheet metal to C-channel that seems to work well too at a thickness of about 3/16" (for the 240v version at least). The label says to use no more than 5 seconds on followed by 5 seconds off, I hit it for about 2 seconds at the 3/16" thickness and it looks to be plenty strong, more than 3 seconds probably would have melted the sheet metal.The unit comes with a power cord terminated in spade lugs - no plug - so be prepared to add your own plug to the cord before you can use it. I can see where some people might find this annoying, but I usually end up cutting off factory plugs and installing my own twist-lock plugs anyway so no big deal here.It comes with one extra set of tips, if my memory serves the tips eat themselves fairly quickly so I'll probably stock a dozen pairs or so.The only thing I can say in the negative on this is the packaging. This is shipped in a cardboard box just slightly bigger then the device itself, with a thin foam inner package encasing the device. The thing is so heavy that thin foam was pretty much completely destroyed when I received it, and the outer box had a few holes in it from where the sharp edges poked through in transit. There was no damage to the device itself, but I spent a couple minutes blowing all the foam chunks off of it with compressed air. I can see where some rougher shipping would have probably destroyed the thing due to inadequate packaging.I'll be looking for replacement tips in larger quantities, and longer tongs would be a nice option.