I recently (ish) purchased one of these before discovering by chance on the interweb that a problem existed. Took mine into the place where I purchased who fortunately have loads of test kit. We ran a few tests and it all seemed fine, this was followed up with a phone call to the Icom rep who advised that the more recent batches have had the fix implemented. He did seem to think that a problem still existed when used with Bose headsets though.
My advice, get it checked out if poss, if not plug your headset in and radio check with ATC while on the ground.
Camel Toe
"Over Macho Grande?"