Hi,
I haven't played with the Medium Machine but I know the guy who make the LNS machine at
LNS Technologies High Tech Products for Hobby, Education and Business, (disclosure: I make molds for him). I know the LNS machines work. They have good temperature control and cost less. Smaller shot size, but very flexible with mold size -- just about anything goes. The Medium design worries me a bit because it generally is good to inject quickly, and it looks like the machine injects slowly. But on the other hand, it should be good at packing the mold because of the high injection force.
Peter