I'm a (very satisfied) twice represented Silverline owner.
I've had Sonatinas (Avalon style cabinets) in a HT set-up in my family room for almost a decade. We use that system for tv viewing every day and the Silverlines perform like champs. When we kill the picture and use the system for music (often when entertaining), I think that they really sound great for their size and price (particularly given the modest associated electronics/source components). An excellent all-around loudspeaker, IMO.
Based on that happy experience, I later got a pair of Preludes for use in my home gym. Footprint was a critical concern, as was bass response and SPLs sufficient to obliterate the fact that I'm usually on a treadmill when listening. That's a tough combination of qualities, but the Preludes definitely do the trick.
I can't comment on their more expensive stuff (just never got a chance to hear it), but the real world products from Silverline represent excellent value, IMO.