Yes I just bought one, the brand new combo ESC and motor. It came with no instructions and like you said no set up button nothing.
I installed it, it has an attached/enclosed 3 amp BEC, the fan came on and the servo worked fine, but it had NO reverse at all and forward and on and of, no modulation sometimes it would run and sometimes not, when it did it was on all the way and jerky, then nothing. It would try to run for a second, a noise and a quick surge, then nothing again.
The ESC wires are also to short and the switch wires are to short.
Trying to get info out of RC4wd was very frustrating. They wouldn't tell me anything, they did say send it back and they would send me a another one.
I did Not want to waste anymore of my time, I think they are just junk. I bought mine new from Teamgonads on e bay. They told me they would refund my $109.00 but not the initial shipping and I had to pay the return shipping.
I asked him before I bought if he had any problems with these ,but he told me no. They weren't to happy about the return, very short with me.
Oh during the brief period when it did run off and on there was no drag brake either.
I would recommend staying clear of these things, to anyone, like you I am angry at spending money on new equipment that does not work, very frustrating, waste time, money and still waiting to get my money back to find something that actually works.