“Bluesound will not honor the warranty on a Node if you use anything other than their power supply.” This is correct, if they actually bother to check that you opened the box. But for me, the low initial entry cost of their devices generally and the performance gain make the risk/reward calculation an easy decision. Just make sure you get a quality after market power supply that provides adequate current and the correct voltage - and hope your streamer wasn’t a factory lemon.
The Node Icon supposedly has a beefier built-in switching power supply, commensurate with greater cost. But replacement supplies are available from Teddy Pardo and others for it as well. For this pricier Node, the financial risk is of course higher, and I do not have any experience with it, but the sound quality reward for replacing the stock supply in the N130 for me was high.
Adding a power supply with a switch also has the advantage of saving electricity, reducing your power use (however for replaced switching supplies this is small), reducing the number of lights glaring from your rack when not listening to digital music, and reducing the potential electrical fields and interference in your rack if you also have a vinyl setup. For serious listening, I turn everything off in my rack except for the source I am using at that moment.
kn