I had a Vias and loved it. The bottom ports are not ideal for shooting prone. I just put a precision armament M-41 on a 8.5lb 308. I can see bullet impact through the scope on 10x at 100yards. Their M-11 is also supposed to be very good and lacks the 360deg. ports.
Precision Armament uses a DLC coating on their brakes and it's phenomenally durable and easy to clean. The M41 has three baffles. The first and nearest the muzzle is pitched slightly forward, the next two baffles are perpendicular to the bore. This brake is a beautifully machined and finished.
