I put the Wild Pig slip on in today and put them on my Electra Glide Classic and I must say I love the way they sound. Quite loud under acceleration but quiet enough to listen to the radio when you are running 60 mph. They took only 25 minutes to install and was quite easy to do. Most of all I was only set back $169 including shipping. If anyone is searching for a budget set of slip-on you should consider Wild Pigs, I am very pleased.
I have wild pigs on my bike along with V&H duels. I love the way they sound. Good sound under acceleration and quiet enough to not annoy you when cruising just as you said.