MG,

The trend in residential pools is probably away from using main drains.

I chose not to have one but my pool is only 6' deep. I see more advantage with a drain in a deeper pool.

I agree with you that the installation of one is a potential source of problems. That said, If I had a pool with one already in it, I would certainly keep it. They have some advantages.

There doesn't seem to be any clear advantage from one vinyl manufacturer to another.