Just got the Mini II & am impressed with the added features over the original mini: speakerphone, longer battery, usb charging, new color (I got the carbon).
Sound is the same as the original-- as far as I can tell. Some people say the II is not as "warm" as the original. I'm not getting that.
There are so many positive reviews of the mini I & mini II that I will just focus on my personal experience.
Negative reviews can criticize the sound but I have made my peace with the mini II. I would characterize the sound as mellow, forgiving and impactful. Which means:
This is not a studio monitor-- it's got a warmth that my ear likes; no fatigue.
The sound tuning is forgiving. You can listen to imperfect recordings/files w/o being smacked in the face.
It fundamentally has more bass than it "should" given it's diminutive size which never ceases to be slightly astonishing.
Some negative reviews focus on the lack of stereo separation. It's true, it's basically mono-- but, I've made my peace with that as well. I now have two high quality powered speakers connected to my computer. When I want to do some critical listening in stereo, that's where I do it. You have to pick your battles.
I've had other bluetooth speakers that fight that fight, but to me it's pointless to try to do it with software tricks or exotic designs. If you want stereo, just get 2 speakers-- done.
Another knock is that it distorts at higher volume. Sure it does, but again, not a big problem. Find me a small device like this that doesn't-- this is not a PA system. The better feature for me is that you can play it at a very low volume & still have the sound remain impactful. Other devices will cut out various frequencies as the volume goes down-- the mini sounds great at low volumes.
Just don't torture yourself with outlandish audiophile expectations that defy our current laws of physics-- that will take all the fun and delight the mini can deliver. Ideally it should be a supplement to your main system-- one you can travel with & easily pick up & move around.
The speakerphone, longer battery, USB charging & voice prompts make it more versatile than the original & sells at the same price point. It paired easily with my phone. Not going to tell my 10 year old daughter that it can pair 2 devices at once:) Attractive design & built to high standards. I'll stop there.
Great update to a classic, Bose. Highly recommended!