AFAIK, kind of like Grizzly, LMS has their mill made in the same Chinese factory as the HF models, but to closer specs and with specific improvements. So it is similar to the HF version, but has a much nicer fit/finish. I've used the LMS Hi-Torque mill (mentoring at the local High School Robotics program), and for it's size it is quite rigid. Also, with it using the very common R-8 tooling, it will not break the bank, and also prepare him with tooling if he decides to upgrade to a larger mill at a later time.
If he can afford a full size mill (space and money), then yes, I'd say go for that. But if space and money are limited, the LMS mill is quite a bargain compared to many of the less rigid and pricey mini/benchtop mills (IMHO). I've used Taigs, the HF mini mills and the LMS Hi-Torques; of them all the Hi-Torque was the one that impressed me the most with its sturdy construction and variable speed (especially for its size). The price was inline with many other, less sturdy machines (IMHO).
JMTCW...