The $39.99 Goal Zero Rock Out Portable Speaker does rock out, but they needs a few adjustments before I can recommend them for a hall of fame.
The heavy-duty case and wooden frame make for a substantial device. In other words, it doesn’t feel delicate, which is good in a portable product. For a small portable device, the sound is adequate. Not good separation, but you can’t expect that in a single-box device. The hanging cord is a good idea and came in handy when visiting Yosemite recently where my Apple iPhone played away while the speaker hung on a door handle.