I haven't heard anyone complain about it lately, but the XM radio volume seems to be significantly lower than anything else on the unit. I'm using a Nolan N90 with N-Com bluetooth and with the helmet being so noisy it is almost inaudible at anything over 50mph even at max volume. GPS directions however, come through fine even if wearing -30db plugs. I finally found ear buds (
Shure SE215) that don't hurt or itch and I put in a headphone jack on my helmet and now it is quite usable. I now turn my bluetooth volume down a notch when I first turn it on. I keep the media (mp3, Sat Radio) volume at 100% and the GPS directions at 40-50%. As you most likely know there is a considerable price difference between it and a Zumo 660LM, most of that is in the
Satellite antenna which needs to be securely mounted or removed when you leave the bike, as it is expensive to replace. The other major difference (660 vs 665) is that since the 660 doesn't have XM, there is no way to get the subscribed weather radar feature (nice for storm avoidance) either. (nor traffic, but I don't subscribe to that.) It hooks up well with both my phones (only one at a time, but I can switch on the fly) and I was able to find dirt
road maps that loaded into it when I moved it to my DR650 for the White Rim trail in Utah. I currently keep the antenna on my dash shelf, but before I had a dash shelf it worked great Velcroed to the right side top cover. If you get one,
this is a handy device (if you remember to use a locking knob on the ram mount
)
Over all I'm happy with the unit and since I found a solution to the volume problem, I recommend it. However, be sure you purchase it from somewhere where you can return it for a refund. Test it out for volume in your specific helmet and speakers or ear buds that you plan on using as soon as you get it. (riding at speed, not sitting in the garage)