I'm trying to decide between that and a GDL-82. I've currently got a G5 AI, KT-76 transponder and a GDL 39R for "IN". I have no in panel GPS. My questions are: 1. It looks like it doesn't come with an encoder standard, can anyone confirm I will have to use my current encoder, and / or what the garmin encoder costs? 2. Can I hook the antenna I'm currently using for the G5 to the GTX-335 and then feed the G5 from there via RS-232 without adding a second antenna? Ok, third bonus question, same as #2 only for the GDL-82, can I use G5 antenna for it and then feed the G5 from there? I can't see spending the extra money for the GTX-345 to get the same functionality I'm getting from the GDL-39 since I already own it, anything I'm missing there that justifies that cost? I also considered the Lynx, but again, not really anything more than I already have other than it being in the panel (on a much smaller screen than my iPad). If it worked with Garmin pilot also, I'd probably consider it. I have to use the iPad for GPS for now anyway, so I think it's better to have the traffic and weather integrated into that interface.