I'm considering wall mounting a 40" LED TV.
Up front, I realize this is a somewhat vague question. Is there any real quality difference between brands or retailers for TV wall mounts? It seems like the big box stores have exorbitant markup; Best Buy prices most mounts $50 to well over $100. I also see visually identical mounts for around $20 from sites like Amazon and Harbor Freight.
What I can't determine is whether these mounts are really comparable. One one hand, Best Buy loves to charge $30 for an HDMI cable. On the other hand, Amazon has become a clearing house for low-quality and counterfeit items. Harbor Freight has served me well, but after the jack stand recall, I'm less confident about any item that holds something heavy over my head.
Is there any standards body that rates or certifies TV mounts that I could look for? For example, UL, ANSI, or OSHA?