I have a set of each. Frankly, the flows are great rims. You’re right. They’re not eyletted, but you need to do a bit of reading because stans rims are not traditionally constructed – the short of it is they’re not eyeletted because they don’t need it.
They give a better tyre shape because they’re wider than 5.1s, they are lighter, feel a bit stiffer (subjective, down to wheel build I do appreciate) and if you want to run tubeless, the stans bead interlock is just as good as UST.
Both my sets of wheels are of similar age. I have a couple of flat spots on the DTs, but nothing on the Flows.