The lower end bikes look like they only have DA shifters and rear derailleurs. The shifters is easy to explain - the only bar end shifters Shimano makes these days is the DA model, so if you get a TT bike equipped with them, DA is what you get. You can get brand new DA bar ends for around $70, so they aren't super expensive components.
To be perfectly honest the component packages on the lowest end QR and the lowest Cervelo look pretty similar. The Cervelo might be a touch better, as its mostly Ultegra (both have FSA Gossamer cranks), while the QR appears to have a mix of Ultegra, DA and 105.




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