Lenovo is a company run from inside of China. We have used some of their stuff from before and after IBM sold Lenovo to the Chinese. The quality at times has been lacking on their monitors and I have seen failing power supplies. I would be reluctant to purchase any Lenovo products. I see Dell as having a little higher quality than Lenovo.
To be truthful, most computer parts seem to be coming from China. However, in the areas of quality control sometimes some chinese companies are cutting corners. I just purchased an Intel Motherboard and the box says Made in China. I dont hate China, I just think Lenovo quality is not good enough. Our school in the past has purchased a lot of IBM computers. Seems like we have moved more toward purchasing Dell Computers.
I work at a community college in Illinois and we have purchased hundreds of computers from IBM, Lenovo, and DELL over the years. I am using this experience and knowledge to base my opinion. I did not buy the computers or order them, however I used a lot of them.