I have experience with the Hogtunes amp and speaker upgrade.
I used this simple to install combo on my 2007 Street Glide for 3 years.
Hands down this was one of the best upgrades for the money.
I could set the cruise at 75 MPH and hear the tunes just fine.
One day after shutting the bike off, I could hear a slight hiss coming through my speakers.
I knew something wasnt right, so I pulled the batwing fairing off and sure enough, the amp was stuck in the ON postition. (The ON LED was lit)
I diagnosed it with my VOM and found the amp turn on lead working correctly.
I e-mailed Pez at Hogtunes and explained what I had encountered and that my amp was out of warranty.
How much to repair it, was my next question to him.
I received a phone call from Pez the next business day.
He apologized for the problems I was having and asked if I still lived at my current address.
I said yes I do and he said that he would send out a new amp ASAP.
I asked him, well how much is this going to cost me and he said - Not a dime, just ship your old amplifier back to me as I'm really interested to see what the problem is.
My amplifier was just over 2 years old - that's 1 year over the warranty period.
The new amp arrived 5 days later and works like a charm

Bottom Line Is.... HogTunes will stand behind there products!
I'm really impressed by this and will continue to give them my business.
I'll be buying the same amp and speaker upgrades for my new Ultra Limited this spring.