I've got a set of reps on order from the U.S. They guy said they are one piece and heavier, but not much. He said the finish is excellent but recommended treating them before use to prevent damage from salt etc as the polished area is not the high grade that BBS use so may mark if left unprotected.
I have a set of genuine CH's but just couldn't resist these at the price. My plan is to get the centres done gold like the race wheels and use them as my winter wheels.
I'll update as to the quality when they arrive.