I have a DX Racer "racing series" chair for the past few months, I've honestly really liked it, granted I don't sit in it for 8 hours at a time, it's comfortable has nice lumbar support. But I think you really need to test a bunch of chairs before buying if possible.
Just did a build in an InWin 303, same mounting system, haven't had any issues so far, same thing, moving mechanical drives from a horizontal to vertical position.