I too have both the early (1984) and later (1999) run of the Key MTs. Trust me, if you like the way the early run performs, then you will NOT be disappointed with the later run. I have the harder-to-find MT-5 4370 in the "1950s version". I may be biased but, for the SP fan/modeler, it's a work of art....
Oh, and since this is the "MORE Co. LIK Enterprises" thread, there SP offerings run equally as well!!