Yep, and I train and race on Conti GP4000S IIs, for similar reasons (having only one wheelset is another reason). There are faster tires, but both the Pro4 Endurance and GP4000S (II) are at a very nice sweet spot of rolling resistance, durability and flat resistance. If maximum possible performance is the goal, different tires are a good thing to target, but there are other factors to consider.