Bought the individual Arms Law, Spell Law and Character Law books in I think 1982 or '83, when I first saw them in a store for the first time after seeing an ad in the unmentionable magazine that ICE's biggest competitor put out. The black and white drawing along with the text explaining something to the effect of there should be no limits to your imagination and with Rolemaster anything is possible. Had been playing the other game for a couple of years prior, but had actually gotten started in fantasy gaming with Avalon Hill's Magic Realm game, which I got for Christmas in 1979. Picked up MERP a year or so later, but never really used it much (except as source material for Rolemaster, as well as a few other MERP modules over the following few years).
After getting Rolemaster, that was nearly all I used for nearly 20 years (90% of my gaming, with me and then one other GM in college (Patrick F.) running a lot of Rolemaster).
Over the past 15 years or so have started to play other RPG's a little more often, but still will choose Rolemaster/Spacemaster over anything else in a heartbeat.
Got to hear the story behind the game incident that started Rolemaster from Coleman Carlton at GenCon in 2017. Was great getting to chat with him and learn about a lot of the early history of Rolemaster and MERP and ICE. Have also gotten to talk in person to a couple of other early employees of the company at GenCon that year.
Was also interesting as last year (2018) at GenCon was chatting with Larry Elmore at his birthday party and he was telling me and couple of the other people who were operating the ICE booth that he had actually done a little work for ICE (artwork for a single MERP module).