Giant Defy Advanced 1 - Worth The Upgrade?

Hi, I was about to purchase the 2013 Defy Advanced 2 today. In my LBS they had 20% off the full range. That brings the Advanced 1 down to the 2 book price. Do you think the move from 105 to Ultegra is worth the extra £500?
Also, they had a strange Giant electronic (looked like a airport scanner) bike fit machine in the shop, has anyone used this before to get sized?
Thanks
Also, they had a strange Giant electronic (looked like a airport scanner) bike fit machine in the shop, has anyone used this before to get sized?
Thanks
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