My Sporty's SP200 handheld isn't cutting it in the Chief -- Akaline batteries are done after 10 transmissions, and range is limited (in spite of an external whip). I'm looking at other handhelds --- the Icon would require re-purchase of headset adapter and PTT switch -- while the Vertex requires no special gear except a BNC to SMA adapter. Anyone using one of these? Experiences pro/con? Thanks!