This Zen stream has served fairly well as a bridge between Roon and my amp/DAC (a Sony HAP-S1, also for sale here). Although this device has a few well-known issues (see the discussion thread on Head-Fi), I didn't have trouble with it after iFi pushed a few firmware updates.

I'm selling it because I upgraded my living room system to a setup that was streaming native, so I no longer need it. I'm the first owner and I estimate it's less than 2 years old (though I'd have to dig up the receipt).