Logitech s715i versus Altec lancing air 5000 versus bose series 2 sound dock?

Can someone compare
Logitech S715i Portable 30-Pin iPod/iPhone Speaker Dock
Altec Lansing inAir 5000 Wireless AirPlay Speaker MA5000
Bose SoundDock Series II 30-Pin iPod/iPhone Speaker Dock
in terms of music quality and longevity
I do not care about cost, but it has to be portable.
I know the logitechs are popular but they are pretty cheap and hence 'look' pretty cheap.

You should be reading test and user reports at sites like cnet.com
(which is the best one I've seen so far).

I can offer one piece of advice with confidence:
Avoid the "b" brand.
It's terribly overpriced for what it does,
and in spite of any and all claims of quality,
it's as cheaply made as anything else.