I'd put them on par with Rubino Pro Slick III's or Vittoria Open Corsa 300tpi cotton clinchers.

The ride nice. They grip well. They are more durable & less fragile than either of the above listed tires.

What's not to like? They are among some of the lowest rolling resistance tires on the market today & last a long time in relation to other similar competators. Amazon has 2-packs for ~$90 depending on season & market. A lot of tires of this calibre can cost $80-90 each. So why not GP5000?

Here is a link to the 3 tires I referenced that I have experience with. I compared them to the Continental GP5000 Tubeless, but it's not hard to select the tubed version if you'd like. (I've used both versions & the GP5000 in any version is cheaper that the Rubino or the Corsa's)