Yes, the Nuforce uDAC is a great device for what you describe, it really improves the sound from a laptop while traveling and it takes up almost no space. As a DAC, I wouldn't describe it as a giant killer but it is a real bargain, either as a DAC or a cheap preamp.
I would describe the Aune SE and the Beresford 7520 with the upgraded opamps as giant killers at their prices. I bought the Beresford after my local high-end shop salesman admitted he had a hard time selling any of his more expensive DAC's after customers listened to the Beresford. I'd like to hear some of the new, more expensive DAC's like the Wyred or the Burson but I'm pretty happy with the Beresford for now.
I would describe the Aune SE and the Beresford 7520 with the upgraded opamps as giant killers at their prices. I bought the Beresford after my local high-end shop salesman admitted he had a hard time selling any of his more expensive DAC's after customers listened to the Beresford. I'd like to hear some of the new, more expensive DAC's like the Wyred or the Burson but I'm pretty happy with the Beresford for now.