I haven't put any thought into it other than 'it'd be cool to have one'. My dad has a '57 panhead that is pristine as well as an '04 (might be '05) Electraglide Fireman's Special. I'll have to show you pics sometime. They are freakin' awesome!

My mom has a '94 Softail Heritage. A buddy of mine just picked up a FatBoy and was telling me about it. I'll look into it someday, I'm interested in the IS for right now.