Originally Posted by
Mojo31
It is not hard or harsh riding at all.
The $50 question is: compared to what? My previous bike was a Domane, so I know that the IsoSpeed can cover some tire sins, but a good tire will still shine through in terms of suppleness, grip, rolling, etc. With the right tires, that bike shouldn't be "not hard or harsh," but an absolute magic carpet ride.
That said, everyone is going to have slightly different experiences, priorities and set-up. You might get a relative idea of a tires virtues, but the only way to know for sure is to buy them yourself. The Conti are a known quantity, the Bontrager less so. But the good news is that they're only tires. If they're only okay, you can get your money's worth out of them in a few thousand miles. If they're really not your thing, you can buy some others and keep them around as spares or sell them.