Cingular Go Phone: Sennheiser MM 450 Bluetooth Multimedia Best-of-Breed Headset (Black) Review

I am not sure where to start!

I own several Sennheiser products including the HD 580, HD 590, HD 600, HD 650, and PXC-450s.

Since I am using my smartphone (Nokia N900) more & more and it works well with bluetooth, I decided to try and replace my TWO year old Plantronics 590A.

The main reason for the purchase of the MM 450s was the "noise-canceling".

Well, after several days of use including in work areas with a lot of "voices" in the background, I have given up on the MM 450s. They sound great but the noise canceling doesn't work very well. I can hear other people's conversations quite clearly when I am in a phone conversation with noise-canceling on (I thought I had it off)!

The MM 450s have also disconnected from my Nokia N900 and Nokia N97 quite often (I have never had this problem with my Plantronics 590s which I currently use all day (+10 hours)).

IF the MM 450s were ~$250, I would keep them because of the great sound... but for $450, I want great sound + noise canceling.

So my set of MM 450s are going back to Amazon!

UPDATE 01/16/2010:

I replaced the MM 450's with my 2nd choice, the Nokia BH-905s! After several days of using them, I think they are almost as good as the MM 450's and the price was only $209.00 delivers (much better than the $450.00 for the MM 450s).

Comparison between both:

Sennheiser MM 450:
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+ Fold up smaller for travel.
+ Sound is best I have heard for bluetooth.
- Price
+ Battery is user replaceable
- Case is CHEAP
- Battery life with noise canceling on was about 10 hours.

Nokia BH-905:
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+ Price is around $200 if you shop around.
+ Case while not small is very good quality (headphones won't get crushed in a travel bag)
+ Battery with Bluetooth + Noise Canceling lasts around 18 hours in my couple of days use.
+ Controls are better laid out (easier to use) than the MM 450s.
- Battery is NOT user replaceable.

Both models:
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+ Both have top notch build quality
+ Both are very comfortable for long term use.
+ Noise canceling on both work when playing music.
- Noise canceling only so-so when in phone conversations (when there are periods of quietness). This is probably to be expected since both headsets are NOT over the ear.

In summary, my choice came down to price for what I got.

I am extremely happy with the Nokia BH-905s

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Product Description:
Best of breed Bluetooth multimedia headset with Noiseguard 2.0 active noise cancelling system.