It is possible that these vehicles were used as demonstrators or company cars, and the fact that they have been SORN'd so soon after registration would suggest they have been kept within the Lexus dealer network. There is no obvious reason why they would not make a good purchase, assuming they are in good condition and have been well maintained. It is also important to compare them in terms of value to other examples on the used market to decide whether or not they would make a good purchase.