Isn't this an ad hominem? It would be relevant if you could prove the commentators had a choice between purchasing devices made in China and identical but more

Isn't this an ad hominem? It would be relevant if you could prove the commentators had a choice between purchasing devices made in China and identical but more expensive devices made in different countries, but there is no way that you can know this. In the comments for the Kickstarter project, Strong suggests that the sole reason that he is able to offer his TangiBot at a cheaper price point than the MakerBot is by moving manufacturing to China. While you might disagree that this is an issue, that does not mean that others' concerns are irrelevant.