There are some very mixed reviews for this speakerphone, so I'll try to review it only as I've used it.I have paired it with two iPhones, a Mac, and a PC, all via Bluetooth. It connected fine to all four items without issue. I have never wired it directly. The pairing with the Mac and PC was done simply to see if it'd work. I tried it with Skype, it seemed to work fine, and I stopped using it and moved it to the car.In the car, it pairs daily with both iPhones. Never an issue so far (after 3.5 months). It has a visor "clip" of sorts built into the base, but it's flimsy and I don't trust it. I have a place on the dash for it, but if you're buying it to clip to your visor, it seems to me that the clip/base will break easily - but I don't know that it will.The included microphone provides better clarity to those you're calling when driving, but the built-in mic will do - it just doesn't sound _as_ good. The speaker is loud enough, but not by much. I'd prefer greater volume. Sound quality, both in-car and to the callee, is very good for Bluetooth and approaches wired quality.I rate it four stars because, as a Bluetooth device, it has worked for me without fail. Many other Bluetooth accessories have failed in that respect for me. Sound quality is certainly adequate, and if your car is relatively quiet, volume is also more than adequate. I basically get in the car, turn it on, see that it has paired, drive to wherever, and turn it off. I keep the volume at max and rarely mute it, so the power button is pretty much the only thing I press on it. I charge it regularly. It has worked without issue for me. Although I haven't used it as such, I like that it comes with an AC adapter and the ability to use it in-home as a speakerphone as well.If I could improve aspects, I'd do the following:(1) Add redial, caller ID, etc - as it is, it's basically a headset in terms of functionality.(2) make the visor clip sturdier (metal clip?) because, as it is, I don't trust it.(3) make the max volume louder, at least if it's plugged into a power sourceIs it perfect? Certainly not. But I've almost always been disappointed by Bluetooth devices, and this one has worked for me.