Well here is an in depth look at them thru pictures. I can see where people are coming from when they say they are "cheap" since they seem flimsy compared to the Ford ones you've had on your car since day one. You must remember tho that the ones you're replacing have been out in the elements for a long time. There are really only a few major differences as far as I can tell - and they may or may not affect the "quality." I took pictures of my driver (left) side install to compare them. The 94 amber lens is always on top and the clear on the bottom in the following pics.
Up close amber vs. clear lens:
Side by side amber/clear lens:
Up close amber vs. clear housing:
Now here's where the major differences are.
Rubber seal/weatherstripping:

And the plastic welds to hold it to the housing:
The mounting studs:
I noticed that the rubber seal had a little more "leeway" as in being more supple/flexible than the stock ones. But this should be normal since the stock ones have been baking in the sun/elements for over a decade making them stiff and brittle. I'm sure they'd be a little more like the clears when they were new or if I used silicone conditioner on them. Then the mounting studs are of a different design. I didn't notice a difference in strength since almost all newer headlights carry the exact same looking stud nowadays. I didn't mind because sometimes even Ford comes out with redesigned replacement parts for older cars. And lastly are the plastic welds that are on the clears look a little more "sloppy" than the ambers which is where I'm sure many of the concerns of the seal tearing away from the housing occur.
Here's before/after pics of them on the car:
Overall I noticed no major difference in "overall" quality in the clears when compared to the stock ambers. As far as the eye can tell, the fluted lens is exactly the same, the housing exactly the same, the chrome reflector exactly the same, and the rubber exactly the same. Only difference is it now makes my ugly yellowed headlights stand out even more between them and the super clear fishtanks.
Hope that helped.