Pros Looks. Sound. Ease of use. Versatility.
Cons Just comfort.
Summary Judging this product soley only sound and looks would have given it a 9. Its great, until you have to wear it. I've used this and the Motorola S9 headphones. The Logitech headphones were more comfortable for the first 3-4 hours but after that, they really started to hurt my ears. I use them at work and wear headphones for 6+ hours most days. These headphones paired very easily to my PPC6700 and sounded great. I didn't experience any interference at all. I love the adapter to plug into different devices. I think that brings the value of product up. If you don't plan of wearing these for more than 2 hours, I highly recommend them.
Pros Sound quality, controls
Cons Fit, size of blue tooth transmitter
Summary Bluetooth: Have not had a drop in 3hrs of use.
Sound: Better than a $20 pair of wired headphones.
Fit: Neck wire hits neck with even the slightest tilt up of the head.
Transmitter fit: I use with Nano and it's a bit bulky. Works okay using an armband so I can tuck the transmitter under my sleeve.
Recommended use: Working out. Might get uncomfortable beyond 2-3hrs of wear.
Pros Good sound, no wires, transmitter works with everything
Cons Reception interupted when not in line of sight.
Summary These won't replace a quality pair of wired headphones, so if that's what you're looking for...don't buy them. However if you need decent sounding headphones without wires for workouts, listening to the TV without waking your kids etc., these are really good, especially for the money. Easy to charge, light, comfortable (need to get used to them), and cool toggle for volume control.
Pros Nice design, good range, lightweight, good sound, easy setup,
Cons Uncomfortable to wear after an hour or less
Summary I'm a follower of Logitech products (especially their laser mouses, which I'd HIGHLY recommend) and I appreciate their sense of style and affordable products. I was able to snag this item for $49.99 (free tax+ship) through J&R on Amazon.com and despite comfort issues, I'm happy with the product. Right out of the box, the receiver and headset is easy to sync and was working fine. I'm no audiophile, but the sound quality was quite good. As far as bluetooth range goes, sound quality doesn't distort or drop until I'm outside about 20-25ft from the receiver (through walls), which is pretty good. Charge lasts for several hours and comes with a split cable to charge both the headphones and receiver which is nice.
My only complaint is the comfort. The silicone loops that were meant to stabilize the headphones started to chafe and cause some discomfort. The padding themselves were the spongy foam-like types used on many other headphones, but slightly thicker. Despite that extra padding, my ears still started to hurt and required several "readjustments".
Also one note, since I don't exactly have an ipod (yet..), I haven't used the receiver on an mp3 player, so I can't speak from experience. However, from other reviews, people have mentioned the receiver's size could be a turn-off. (It's roughly 1.25"x1.5")
Comfort being my only main concern, I'm enjoying the headphones and I'm hoping Logitech will come out with a product that will address this comfort issue. Great product for ($49.99)!
Pros Excellent sound quality - litte noise leakage
Cons Non compatible bluetooth
Summary I bought these to run from my already bluetooth enabled laptop while commuting. They come with their own bluetooth transmitter that plugs into the stereo jack. They can be re-paired to another bluetooth adaptor, but constant pairing problems and range down to 4 feet. The biggest pain is when the bluetooth transmitter runs out of battery and your down. Didn't want the thing in the first place! Almost a great product.