I don't think Winspace count as a knock off brand. They have an importer here in the UK. They are obviously trying to build a brand name, sponsoring Minsk Conti cycling team and have employed Joe (aka China Cycling) a popular youtuber. This is probably why a number of other bloggers have had their wheels to review such as Hambini, Peak Torque & Cam Nichols through Joe. I think the T1500 used designers / engineers from outside China for aerodynamic input so I am guessing this will be computer rather than wind tunnel models. It seems a bit heavy compared to say a Venge, and know idea how it stacks up aerodynamically, but seems reasonable enough from the reviews if not ground breaking. I would say Costello is more playing on the copy thing as one of their bikes looks very Cervelo S3 like! I think there are a number of brands particularly for wheels (rg light bicycle, Farsports, Yoleo) that are trying to grow their reputation and direct to market credentials.