I got this for using while on Holiday at our apartment. I have been using 2 X-mini II's (2.5w each)or my JBL On Tour travel speaker (6w)which have been great for inside the apartment. Last holiday we had about a dozen friends over for a BBQ on the roof terrace and I used the X-mini's that time. At first the sound was ample enough but later on as the drinks flowed and the dancing started the music just wasn't quite loud enough so I had to borrow a friends portable speaker. Well not really that portable to be honest. Hence the purchase of the JBL charge. Took me 30 seconds from getting it to having it hooked up via bluetooth to my Samsung SG2 and playing at full whack in the living room. Have to say I am very impressed. Very clear sound and decent bass. This will be perfect for our next BBQ on the roof. I was going to get the Bose soundlink 2 but at twice the price and not that much better it just wasn't worth it. Also the Bose is an awful lot heavier. The JBL charge is a perfect combination of sound, weight/portability. The travel case is really good and I can hook it to my belt when weighing in my hand luggage (I don't use hold bags) allowing me to utilize my full 10kg allowance. Couldn't do this with the bose. I also paired this with my Asus transformer tablet, simple enough task. To switch between my devices I have to disable Bluetooth on the current one that is playing then go to the Bluetooth menu on the other device and connect. Multi device support would have been nice but pretty straightforward and simple enough to change source device. Equalizer support not available via Bluetooth but that's a Bluetooth limitation. Sound improves if you hook up via a cable but then that goes for all speakers. With cable connected equalizer is available and also when using my phone or tablet I can crank up the volume a tad more using an app I got from the play store. Get about another 6db and the speakers handle it without any distortion. Another bonus is the charge port. It can charge my phone, satnav, archos media player, it won't charge my asus tablet but that is because it needs a USB 3 charger. The included charger is a 5v 2amp USB charger which is very lightweight.
One point to note is that when I tried to charge my SG2 it kept starting and stopping with a beeping sound, basically not working. I figured it may be because I have a custom Rom running on the phone, all I had to do anyway was disable USB Debugging on the phone and it works perfectly.
I also hooked up my phone to the 2 X-mini II's and then those into the JBL Charge, it worked giving even more power but that was just overkill, I wanted to see if I could.
My Verdict: Very portable and perfect for travelling and house parties. It won't blow the roof off but that's not the point of a portable speaker that's also suited for out and about use. Best portable speakers I have owned.