I have purchased "a bunch" of Chinese electronics parts from ebay, about half of which are various digital panel meters. Overall the success rate is about 67%: One third of the gadgets don't do what I want or are just plain junk and end up in the trash, and the other 2/3rds are incredible bargains that work very well. I'm talking under-$20 items here, and I've done a few projects that never would have happened if it weren't for the low cost parts. I consider it an overall win, with the 33% loss being a disappointing but acceptable overhead.