Pros It's easy to setup, comfortable to wear even on long drives, very clear sound on the person you are callings end. I've been told it doesn't sound like I'm on a bluetooth headset.
Cons LOTS of noise in the background. At times it's barely noticeable and at other times it can drown out the sound of the person I'm talking too.
Summary IMO it's not worth the $60-70 price due the only con being a HUGE one. A lot of people talk about it not being able to control music and some other iphone commands but most headsets that do that are considerably more expensive so I didn't hold that against the M100.
Pros Voice updates for device status, 'power on and off', 'remaining talk time', 'lost connection.' Low sleek profile.
Cons Tone on tone printed info impossible to read for model number, etc.
Summary Love it!
Pros Light weight, good looks, great sound and easy to use.
Cons No USB cable included, not able to upgrade firmware or stream music etc.
Summary I bought a Blueant T1 for my iPhone 4 and it simply didn't communicate with the phone well at all (it was no better than my 6 year old Micro). Although the T1 has some great features (if you use an Android phone) the M100 seamlessly interacts with the iPhone including it's battery indicator displayed at the top of the iPhone screen.
Pros Sounds good. Good range of volume.
Cons I have a mytouch g4 which can send emails, texts, search the internet, etc on voice command, but I can't do it through the headset!
I can't hear audio for youtube/video/pandora.
The headphone hurts my ear, even with the smallest earbud.
Summary I am only keeping it because they were clearancing out the blue ones. Otherwise
Pros Easy to pair with my Moto Droid. Sound quality is very good. Light weight, and comes with several different ear fittings. Will pair with two different devices, which is good for using it with my PS3.
Cons Still doesn't have the quality of a boom microphone headset, but who wants to wear one of THOSE (unless you're a truck driver like me and the bigger headset doesn't matter).
SummaryWe caught a deal at Best Buy for $44.99, which REALLY makes this a good deal. I liked my wife's SO much I ran back in the store and bought one for me...!
Updated on Jan 2, 2011