I've had a number of them done on my Jeep JK and my Ram. A couple of times I asked the guys if they were all he same, factory vs aftermarket. "They are the same and they are all DOT approved, with the exception of any logos" was his answer. And so far, I can't find any other difference. Jeep has a small Jeep symbol on the glass that I do not need and raises the price $70. After a couple of Safelite bids of $325. -$375. I am happy to pay the company I go to $180. - $200. I'm done in about 45 minutes.
Saying it's "free" through your insurance company is fine, but after a few replacements, err, claims, your rates my reflect the difference. Free isn't free, as somebody pays and Safelite is the highest priced company I've found. Lots of advertising overhead, for one thing, and that has nothing to do with quality glass.