Modern Headlights

I replaced my sealed beams with the AutoPal replaceable bulb units because they were given to me for free so I thought I might as well give them a try. I had read over and over that they are junk, don't use them, but I never got a reason why. I drove it at night a couple times this summer and was very pleased with the lights. I made a relay kit for my headlights, so I know that has an effect on it as well.

So what is the problem with them? Are they hard on oncoming traffic? Do they fly apart going down the highway? Why are they so bad?

Cley