Lots of not so helpfull comments? This used to be a decent place for advice on kit!
Obviously i dont just ride the same 40 mile route, i just thought it would be a good benchmark to see how much of a performance improvement a new bike would give me over my current ride.
Not many decent online reviews on the Cube bike so i thought i would ask on here. The bike will be used for sportives, i ride 2-3 times a week from 20-60 miles. My LBS said Cubes are rubbish and i should buy a Scott or Specialized - i get the feeling he is pushing the kit he has the best margin in!
I have a Cube and I don't agree with your LBS. It rides very well and was excellent value. Having said that, if my budget was over 2 grand I would be looking at other brands and seriously considering electronic shifting. I have never ridden a Scott, so can't comment but not sure how much bike you get for your money and the same is definitely true for Specialized. Over-priced for the spec, IMHO.
I would be looking at Cannondale Supersix and definitely Canyon Ultimate CF. Others will come along shortly and sing the virtues of Specialized, no doubt
Riding a lighter bike will generally offer some performance increase. A lot is going to depend on the typical riding you do and your fitness, of course.