I'm not sure about Harley's, but on other big bikes, guys either love them or hate them.
The wear well and handle well, but many Goldwing and other big bike owners have problems with their quality control. Lot's of low speed wobble reports for front tires, and/or high speed wobbles at high speed for rears. The Valkyrie forums are full of these, which is what I have experience with them.
I run the Metzler 880s on my EGC and very much like their handling and wear, and you can get white walls.