I recently added a Heil iCM to my 735. Nice improvement. I'm going a step further by going through the rear ACC jack for audio and may also change to a 2.8 wide filter in the future. (comments welcomed) I had a question or two regarding this and sent an email while working 20M while it was open at 2 AM EDT this morning. (Aus,NZ and Fiji barefoot) I got a reply from Bob within a couple of hours, around 5AM EDT. I wouldn't have expected a response that quick on a Sunday no less. Pretty cool. I compare this to a recent customer service inquiry to Merrill that makes great outdoor shoes. I asked about a product I have and the guy there responded and said he wasn't familiar with it. He asked me to email a picture of the shoe back to him which I did but I received no response back after that.