Carbon Road Bike Upgrade

I'm looking to upgrade to a carbon road bike for the summer. I currently ride a Defy 1 but have been looking at endurance carbon road bike options.
I've come down to two options - Trek Domane 4.5 or Cube Attain GTC Race.
I love the look of the Domane and the isospeed decoupler seems neat but I am put off by not having full ultegra which the Attain does.
I've heard mixed reviews of the Domane but haven't seen a full review of the Attain as yet. Given the spec and what seems to be a very good price I'm leaning towards the Cube but I would appreciate a bit of advice.
Has anyone ridden or own either of the bikes?
Thanks in advance!
I've come down to two options - Trek Domane 4.5 or Cube Attain GTC Race.
I love the look of the Domane and the isospeed decoupler seems neat but I am put off by not having full ultegra which the Attain does.
I've heard mixed reviews of the Domane but haven't seen a full review of the Attain as yet. Given the spec and what seems to be a very good price I'm leaning towards the Cube but I would appreciate a bit of advice.
Has anyone ridden or own either of the bikes?
Thanks in advance!
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I havn't ridden the Cube Attain so cannot make any comment on that bike.
My Domanes are great and the isospeed decoupler does seem to smooth out the bumps on our censored UK roads. I do find the 5.2 carbon slightly more foregiving than the 2.3 alu. I have done century rides on both and wouldn't hesitate in recommending the Domane but I know Trek bikes do divide opinion due to their past history of a certain Lance bloke !!
I went for the 5.2 rather than the 4.5 as i wanted full ultegra and internal cabling - maybe you can ask the shop to upgrade the 4.5 to full ultegra for a small price. When i purchased my 2.3 it wasn't full 105 but as part of the deal i got it upgraded to the full 105 package.
I would certainly try and get a decent test ride on both Trek and Cube though before spending that sort of cash. One of them may suit you better than the other.
Good luck.
What are the bontrager wheels like on the trek by the way?
I'm definitely going to test ride them both to see what it's like, the £50 deposit for a test ride on the trek is refundable sounds like a no brainer, going to have a look at the cube later this week.
What size bike are you in a Trek as i notice that Evans cycles have the 2015 5.2 at £1800 in a 58cm (it the orange colour so you may not like it anyway).
I would try and negotiate with the bike shop on a 4.5 to get the full ultegra thrown in.
If you go Evans, check your employer to see if they have a discount scheme - mine does, and it means you can buy a voucher at 10% below actual value - have used it to save over £200 on both mine and my gf's winter bikes.
Marin Palisades Trail 91 and 06
Scott CR1 SL 12
Cannondale Synapse Adventure 15 & 16 Di2
Scott Foil 18
I'm interested in the new Cube Agree too, but like yourself can't find much in the way of reviews or experiences for it.