I have a question on the IC718. Since I seem to always ask my questions over on the other forum, I thought I'd give this one a shot this time. A friend of mine has an IC718, so I thought I'd give the manual a going over just to familiarize myself with this rig. One of the options is an SSB filter that costs about $220. It's the 1.8kHz FL222. What I am wondering is what advantage would someone have in paying that kind of money for this filter. The radio itself only runs $650, so, adding a $220 filter would jack the price up considerably. I know that the purpose of the filter is to zero in on signals better, but how much better would the radio perform than it does with whatever filtering it comes with standard? I couldn't find any information on how wide the standard filtering is, so I don't have anything to compare this FL222 with. Any information y'all could provide would be greatly appreciated. My friend doesn't really know the answer, and I'd like to know just in case I decide to get one of these 718s. Thanks.