That's a good price. The Total Bithead is a very nice gadet for laptop users because afaik it's the only portable-amp-dac combo that is USB-powered. The Porta Corda or Headphonia may sound better, but batteries - even if they can be recharged internally - are a huge hassle for me. That was the main reason I bought the Total Bithead. Soundwise, it's not a quantum leap from the Macbook's line out, but there's a small improvement. I don't know if the Macbook's internal DAC (Wolfson chip, I think) might not even be better than the Bithead's but again, I like the USB-power.
And definetely clear!