I'll just share that I sat and listened to the Q350's for about an hour at my dealer while some of my LP's were being cleaned. It was hooked up to a Marantz PM5005 integrated and streaming Tidal Hi-Fi from a Bluesound Node. On stands about 9 feet apart, out from back walls about 3 feet and away from sides about 2 feet, I was seated 10 feet away.
They really so sound incredible for the money. As my son owns a pair of Q300's and I've heard those plenty, the improvement in the Q350 is immediately clear. A much smoother speaker overall, with a little more bass and seemingly flatter response I think they'd give the R series a good run for the money. Placement is more important now, being a rear ported speaker where the previous version is front ported. The tweeter seems the most improved as it seems to reach higher without ever being harsh. I dare say reminiscent of a very good silk dome. The soundstage is the most impactful part of them with great depth, definition and the ability to be to left, right or center and it doesn't change dramatically.
In that room anyhow, I think they clearly stomp the Paradigm Monitor, B&W 685S2, SVS Prime and PSB Imagine XB that sell in that same room. That's my ears though, no one else's.
KEF R500, R200C, R100, SVS SB2000 sub, NAD T758 receiver, Pro-Ject RPM1 TT w/ Ortofon 2M Red, Bluesound Vault2, Sony BDP-S480 BlueRay player, Samsung UN55JU6500F 4K LED TV, KEF M500 headphones, Sony CDP-CE500 CD changer.