I started playing TTRPGs in 1982 with the D&D basic set.  In 1985 when Spacemaster was first released in a boxed set I purchased it and proceeded to buy every supplement as they were published through 1994.  I GMed a moderately successful campaign in the late 80's and into the 90's.  During that time I also co-GMed and played in a MERP 2nd Edition game set in the First Age of Middle Earthl; and played in a Second edition Rolemaster game as well.  Recently I joined a game on RPOL using the Rolemaster Standard System (RMSS).  So far I prefer the Second editions but time will tell.