The Arctic fan profile on the Freezer 4U SP3 is not terribly different from Noctua NF-A12x25s in practice; I’d at least give it a try before worrying. At very low speeds you can hear the bearings in open air, but that noise vanished entirely inside a chassis at desk distance for me. At moderate to higher speeds an NF-A12x25 will whistle more on the exhaust side, due to the fin stack right up against the intake. A Phanteks T30 behaves the same way, only a bit louder.
In terms of flavor, overall the Arctic sound has more defined notes, Noctua is more broadband.
And yes, people have attached Noctuas with zip-ties.
The heatsink itself doesn’t feel cheap; the thing’s a 2.8 lbs copper brick. You wouldn’t want to ship a system with it installed unless you had a custom anchor to the chassis. About the only thing I can complain about is that the heat pipes tops are non-uniform.