I agree, this is a nice set up. I have the original Bose SoundLink Mini which I purchased in January 2015. It has terrific sound and worked flawlessly up until about a month ago. It now has an issue with intermittent shut-off. The speaker will just power itself off randomly when being used in battery mode (i.e. not plugged in). There are many, many reports of this issue on Amazon's customer review pages. Too early to tell if it is also a problem with the SoundLink Mini II as this new model has just been released. The original SoundLink Mini is still also being sold for about $20 less.
This may not be an issue for people who just intend to use the speaker as an alternate speaker set-up for their iMac and keep it plugged in all the time. Just be aware that this problem does exist (without resolution by Bose) if you intend to use the speaker as a portable bluetooth speaker for your iPhone or iPad, etc. as well...