FWIW, I have three digital calipers, bought from Aldi here in the UK from time to time. One is about 4 years old, and still going strong. I've just tested it against a good micrometer, and it over-reads by about 2 thou/0.05mm on a 1" test gauge, which isn't too bad considering its age and price. Not the ultimate in measuring devices, but very handy to have around, particularly for those who find themselves working to dual standards.
I did have a fourth, which taught me that the cheapos make just the same sound as more expensive ones when hitting the floor.
Andy