I bought a Bose soundlink on sale for $225 at my local NEX.
I also got these units from Amazon:
1. Logitech wireless Boom box $109.96
2. Supertooth disco $100.45
3. Monster clarityHD $63.57
For ~$49 more for the above 3 units, I decided to return the Bose - it sounded good but muddy overall on some of the music I like to listen to (pretty much everything but country).
The Supertooth sounds good overall and the 28 watts RMS stay the same level when its plugged in or unplugged.
The Supertooth is only a total of 3 speakers - right, left and sub so the sound isn't quite as full as the logitech unit.
The logitech unit isn't built as well as the Supertooth Disco but it is lighter so its easier to carry around.
The logitech sounds best when plugged in as it gets 20 watts RMS plugged but the power output drops to 6 watts unplugged to conserve battery (the Supertooth disco battery still lasts longer than the logitech though).
The Monster clarityHD sounds really clear on most music that doesn't have much bass to it but the passive radiator doesn't really produce much bass response at all (compared to what the logitech unit can produce with its twin radiators).
The Monster unit is a good, small portable speaker that I can carry on my motorcycle and not have to worry about breaking a more expensive, less portable unit.
This gives me three speakers for slightly more than the sale price I paid for the Bose with more rewarding full sound on 2 of the 3 units and the benefit of a "super portable" speaker.
Overall comparing all 4 units, I like the bass, mids and trebble on the logitech unit the best.