First, the bad news. I bought one of these from Amazon, and they sent me the older version of this product, which is *not* compatible with the Nokia 3650 (despite the fact that the **item name** says it is). If you have one, and it refuses to work (mine would pair with the phone but wouldn't actually receive or send any sound), you probably have one of these. If you intend to use this with a 3650, I recommend buying from a source other than Amazon until they get this straightened out. The correct model has a big blue sticker on the front of the box saying &quot;Now Compatible with Nokia 3650!&quot;The good news is that when I called up JABRA (who has an actual operator, a welcome change from voice-menu systems), they were happy to give me an RMA number, and quickly sent a replacement headset out to me. The new one works great.This thing is awesome. It's a little pricey for a headset, but if you also consider it to be an alternative to a full car kit installation (except you can take it with you), it's a great deal. It's really nice not to have wires dangling off of your ear in the car, and I prefer it to using the speakerphone mode. Sound quality seems fine -- I get a *little* bit of static every now and then, but it's hard to tell if it's from the headset or my phone. The mic, despite being nowhere near your mouth in their design, works very well. I haven't pushed the range too much, but Bluetooth is rated to 10m (30ft). It's pretty light, especially considering how long the battery lasts (haven't tested it myself, but supposedly up to a week on standby mode). I'm not sure if I'd want to wear it for hours and hours on end, but it's as least as comfortable as the crappy wired headset that shipped with my phone.I have two small gripes. First is that I wish the earpiece was more &quot;posable&quot; -- while it's flexible, it's made out of a fairly stiff plastic/rubber material, and you can't exactly make it follow the contour of your ear (at least I can't). I may just have big ears :P. It still fits pretty well, but this would be nice to see in a future model. Second, if I have the headset turned on but not in my ear, and I dial using the phone keypad (as opposed to voice dialing or doing last number redial through the headset), the phone exclusively uses the headset rather than the phone's internal speaker/mic. Once or twice I've called someone and not gotten any sound because I left the headset on and had it in my pocket -- now, technically, this is a problem with the 3650, and there's probably some way to disable the headset in the middle of a call, but it's still annoying. As long as you remember to turn the BT100 off when you take it off, it works fine. :)If you have a 3650, also be sure to use the &quot;alternate pairing sequence&quot; (hold the 'Volume Up' and 'Power' buttons instead of just 'Power' when you go to pair it) to get extra features, like the ability to put people on hold using just the headset buttons. Details are available on the JABRA website, and may come in the package with the newer model headsets.If you own a bluetooth phone, and don't own a good headset/car kit already, do yourself a favor and pick up one of these. You won't be disappointed.