I use a welder every day to make money so it's important to me that it be reliable. A few years ago, I had a need for a Plasma cutter for a job and rather than spending my $1800 budget on a Thermal Dynamics or similar, I purchased a Chinese made invertor based multi-function device that would give me a 250A AC/DC TIG, 50A Plasma and 250A Stick. I've always wanted an AC/DC TIG but never really had a need for one so I thought this would be a good compromise. Well, the plasma worked for the job I got it for but a few months later had lots of problems with both it and the TIG, where they really just didn't work. The arc would die or not strike, it gave me codes, all kinds of problems. It was still under warranty so I called and after close to 2 months, finally got an RMA to send it in for repair. They had the machine for close to 3 months before I finally got it back and it was still doing the exact same thing. So I called, emailed, etc. again and got some response and then just got ignored, at which point I posted some online reviews which were seen by the owner who contacted me and offered me a new machine. By the time I finally got the new machine, it had been close to 9 months from the date of my first call. At this point, I'd lost all faith in it at all so I sold it on eBay for $1500 (losing about $500 on the machine and shipping costs) without ever plugging it in. Maybe the replacement machine would have been bulletproof but I wasn't willing to take the chance. The seller did ultimately do everything they could to solve my problem but since I use my machines to make money, the time it took just wasn't worth the cost "savings" in the end.
Since then, I've only bought name brand stuff with local repair facilities. One of the reasons that the name brand stuff costs so much more is not only that they're built for industrial use instead of hobby use but they also have the network in place to get machines repaired locally with parts support rather than sending them back. When one of my Lincoln welders went down, I dropped it off at my local welding shop and had it back in my hot little hands 10 days later in perfect working order. I still need to keep a backup machine but 10 days is a whole lot better than almost 9 months.
If you need a stick welder, as has already been mentioned, you'd be hard pressed to find anything better than the old Lincoln IdealArc tombstone welders. That's what I learned to weld on 25 years ago with a machine that was probably 40 years old at the time, and I'm sure it's still kicking in that classroom today. Watch your local craigslist, you'll find them on there anywhere from $200 - $500 and I can promise you that other than submerging it in a pool of water or burying it in the dirt, it will work every time you turn it on. Even the AC225 is a good little machine that can be relied on.