I have a Yihua 858D and mine works reasonably well. At least as well as can be expected for under $50USD shipped. I did open mine and it was wired correctly but YMMV. If you get it, peek under the skirt to see if anything is amiss. If not, you're good to go and if there is some wiring/grounding issues, just fix it and you're still good to go. Just remember that it isn't a $3000 JBC unit.