I’ve been very happy with Gatorskins in 28 size at lower pressures (85 rear/65 psi front). The ride quality seems quite good on decent roads, especially on curvy hills. I don’t like the Gatorskins ride quality at higher psi though. I really don’t worry about flats anymore which is fantastic.
that said, I want to give the gp5000 a try if I can find them someday.