What's your take on sideways racks?

Do they offer the proper temperature gradient?

Will a 32 quart Sterlite sideways with 4 inch Flexwatt belly heat have enough room to offer a "cool" side?

Would there be any special considerations when using a sideways rack?

They seem to be better for cost efficiency when you can combine the 32 quart sideways with some 15 quart narrows.

Thanks everyone for any input you may have.