I have the first incarnation of the Monster iCarPlay Wireless FM transmitter, which I've used for my Classic and Touch for many years. I just got the iPhone 4, and now, whenever I plug it in, it tells me the device is not optimized for use with the iPhone. In addition to this, it says signal strength might be lost if I utilize the device. I used it one day (I have a hr long commute both ways...and didn't know about the error until the day I plugged it in) - and the iPhone still charged, and still transmitted my music perfectly. The only issue was that Yield sign on my main screen. I don't talk on the road, so the dropping of wireless strength will not be an issue. Is it still ok to use it despite the warnings? I ask because I shelled out almost $75 for that transmitter back in the day, and after purchasing the iPhone, along with the case and protective gear, I'm not sure if I'm very willing at this point to shell out another 50-100 bucks for an FM transmitter while mine otherwise works fine. Thanks.