I ride "cheap" imported carbon wheels.
I could not afford big brand wheels - so took the risk. Albeit - I bought them from an importer who provides support and warranty. I figured it was worth the additional premium. Incidentally they also brand the wheels - but it's pretty obvious what the origin of the wheels are.
So I wouldn't say having no brand is a bad thing. But having no local warranty, backup and support is definitely a bad thing.
The wheels I bought look identical to those available from other well-known places.
I rode them for a year - through dry weather only. I've put significant mileage through them. I have not done any long mountain descents on them - which is a risk on any carbon where heat builds up and can warp the rim. It's something which can happen on any carbon rim - and I have heard it from riders of branded wheels too.
I'm a lightish rider at 69Kg. And of course - I pulse the brakes on descents to help prevent build up of heat on the rim. I've ridden the wheels pretty hard in training and group rides. Hit the odd deep rut - which only caused a snake bite puncture and tiny mark to the rim edge.
The wheels are still straight and no loss of tension - I've not had to true them. I cannot confirm if the importer has tuned the wheels on receipt or whether they get sold as-is. Whatever, the wheels have remained very straight - more straight than any of my alloy wheels (Ultegra, Aksium, Ksyrium).
They're the only carbon wheels I have ridden extensively. What I did notice was the rear wheel was a bit "whippy" - I can feel flex under hard out of saddle pedalling (sprinting). Perhaps this is normal for carbon(?).
The wheels weigh about 1550g for a 38mm torroidal / wide rim. Not bad. But bigger brands are lighter by about 100g or more for the same depth or deeper.
I was happy enough with them - to buy a second set of wheels. So perhaps this is my biggest endorsement.