Bought this one to power my saxophone clipon mic from Shure Beta 98H, because the LDSystems Roadjack 10 I use to cover beach weddings has no Phantom Power.
This one actually looks very sturdy and like the LED's for better monitoring the power that is left in this little thing.
The size is like a pocket sized item that fits everywhere, but the best of all is you don't hear any difference in audio quality by using this.
I like this and recommend it strongly. As for how long it lasts, well, that is still to find out!