I used WordPerfect for the Amiga. I was in high school, so I didn't use any features beyond what you'd need for an essay or report - it seemed equivalent to the equivalent DOS version (4.x) from this perspective.
One of the challenges I had was printing french accented characters on a LaserJet+ clone - an issue I never resolved, and didn't encounter in the DOS version on my parent's PC.
It's truly a darn shame that the piracy situation was so rampant on both the ST and Amiga platforms. It's pretty much the main reason why WordPerfect (and a variety of other software) was pulled from the market, in favor of the PC and Mac markets.
One of the challenges I had was printing french accented characters on a LaserJet+ clone - an issue I never resolved, and didn't encounter in the DOS version on my parent's PC.