I did an order recently with LCSC where I combined shipping with a PCB order from JLC. Not impressed either with the way they handled it.
While mine did at least turn up together in one package, it was the rest I had trouble with. Firstly, I got a "your order was shipped" e-mail from JLC when according to the order progress on LCSC that half wasn't even ready for despatch yet. Second, the tracking number in that e-mail, while it was for my package, was linked to the wrong site (17track), which had no record of it (should have been 4PX, which did). And third, even though I have since received everything, my LCSC order status still says "waiting for pickup".
So, the accuracy of communication is terrible. Will probably not bother doing it again, and just pay the extra few pounds for separate shipping.