Hi Nelson,
Just about everything these days seems to be made in China, or has parts from there. I think the problem arises is that everything is built to a price point, so it is not as much where it is made but how it is made and the QC. I have become a little more jaded on buying some things direct from China through eBay, as it is impossible to return (due to the shipping cost) and essentially no technical support should you have a problem. The Teco VFDs are very good, I have heard of one individual that had some problems with an L510 not working well with his mill motor, the Teco N3 has been around for a long time and is very similar to the Automation Direct G3, both which are very good. Many of us have used the Hitachi VFDs (WJ200), I have not heard of a problem or failure. The programing on many of these VFDs can be a bit daunting, but not so hard once you get started. If you don't know or have question just ask and I am sure we can help. I understand the cost issues, so if the budget is limited, then the HY is hard to beat, especially if the money is tight. It is a learning process of knowing the different features and just buyer beware. I think a VFD adds a lot of features and controls, and at fairly reasonable cost at the 3Hp and smaller size.
Drive Warehouse has free shipping on their VFDs, I have purchased quite a few from them and they tend to have the lowest pricing. They also extend the manufactures warranties to a total of 3 years for drives, although I have yet to see a major brand VFD fail in this time frame.
Mark