I've owned a GK 800RB since 1987 and have used and abused it for seventeen years without a problem. Hurricane Katrina swamped the rehearsal house where my amp gear was stored with 24 feet of saltwater,mud,and no telling what else, for over eight hours. It was over four weeks before I could even get to the site to try and recover anything that might be left. I found the amp coated inside and out with dried mud and corrosion. My new GoliathIII and my EV 1x15 cab was the same with covering coming off and, of course, all speaker cones trashed. I contacted GK & SWR to see if they could offer any help as this was a very costly disaster for me in many ways. I also emailed Dave Funk as I had read so many great reviews of TF amps and felt certain that the 800RB was totaled. Dave was the first to respond and offered a special deal on a TFB550 which I gladly accepted.(thanks Dave). Best tone of any amp I ever owned. GK was next and offered endorser pricing as well as checking out my old amp. SWR basically said "sorry charlie" which really disappointed me as I have been a faithful Fender player and a dealer at one time. I took my GK amp, removed the top & bottom covers and flushed it out with a garden hose,removing as much mud and gunk as possible. Then I placed it on top of my home air condtioner compressor unit with warm air blowing into it to dry. Sent it to GK. They called the following week and said "Guess what! Your amp works!" All it needed was one pot, a fuse holder and a good cleaning. Got it back last week and works as good as ever!! So now I have two great bass amps. I just wanted to share my experience with you guys as to GK's reliability and customer service as well as Dave Funk's character and expertise as an amp builder.Thanks to both!!