I've bought 3 bikesdirect bikes, two for my kids back in 2012 and one for myself in 2019. The kids bikes (adult models but in 43cm as my daughters are short) were $350 each and my bike was $800. Everything follows standards, including the generic headsets/BBs on the kids bikes. The $800 bike was largely 105 R7000 with some FSA stuff (bb, crank, headset) and all standard.