I have the factory tow mirrors on my '14 Ram.
They're great to tow with and I'm glad I got them.
My only complaint is that they didn't have a power option at the time (not sure if they do now), and those mirrors stick out far enough that it's a good idea to pull them in when you park anywhere public.
Just kind of a pain to walk around and do that manually all the time.
To each their own, but I tend to avoid "cheap on ebay" variants of anything.
More often than not, you're going to be disappointed. The way I see it, these aren't cheap trucks. Why put cheap things on them?
Unfortunately, the OEM ones are pricey. Especially for the driver's side.
Found that out the hard way thanks to a city bus.
One caution if deciding to change them out. The temperature probe for your outside temp. display is located inside the driver's side mirror.
If you don't get an OEM mirror, you might want to check and make sure the part you get includes that probe.