Blah, had this whole post written up and my phone ran out of juice, taking it to limbo...
Anyway, I ordered myself an MW600 a couple of weeks ago but I haven't been able to try it out since a family member decided they'd repurpose it as my Christmas gift...

At least it saves me the $40! Anyway, when I get it I intend to compare it from my phone/IPod touch (using my Etys) vs a Clip Zip, should give me an idea where it stands. I guess I can also compare it with a more rudimentary Miccus Bluebridge MiniJack RX BT adapter I got a while ago (mostly for patio/beach use with cheap speakers etc.).
The MW1 looks interesting but it'd have to sound much better to justify the large price/size increase IMO. Still, the SMS/call log functionality on it seems genuinely interesting. Maybe I'll order it from Amazon at some point to try it out.
I was aware of a couple Samsung/LG adapters that feature apt-X when I got my Sony but I opted for the latter anyway for several reasons... There's actually several variations of apt-X and only half of them are meant to transmit lossless audio. I've actually compared an HTC apt-X BT adapter against that mundane Miccus I mentioned before and I couldn't tell the difference... There's so many variables at play tho. Could be SBC with a high enough bitrate is indistinguishable, could be the HTC adapter had other weaknesses, or it could simply be that the powered speakers and car stereo with which I tested weren't resolving enough for me to notice a difference...
I did a blind test and everything tho. Didn't have my hf3 at the time tho and I wasn't gonna be using either adapter with headphones anyway so I didn't bother with any of my other pairs. The Sony adapter(s) have other obvious advantages like the display for tracks/caller ID etc, which is the other reason I was drawn to it.
I hadn't read much about the Samsung adapter mentioned in this thread either, there's a similar LG I took a hard look at but it has some serious usability flaws... The thing doubles as a BT headset (actual in ear like any regular headset) which is rather neat, but it requires the use of an (included) adapter to plug in any headphones with a 3.5mm jack. I read it wouldn't seamlessly transition between music/phone modes automatically either, so I quickly gave up on that one.
Edited by Impulse - 11/23/12 at 9:10am