Specialized Tarmac SL 7 Expert Ultegra Di2 -The Best Mid Range Race Bike?

The Weekly Top Bike this week goes to the Specialized Tarmac SL 7 Expert Ultegra Di2. A race ready bike sitting at £5,000 price point which makes it really appealing.
However, poor wheels let this bike down a little and this would be the first thing to purge.
What do you think of this bike?
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