Do you have any Ruger semi-autos? While I don't have a P89, I'm extremely pleased with my P90. I've had the chance to shoot a P89 and was just as pleased with that. The P-series pistols are great pistols. Nice and rugged. I do prefer the hogue grips on them though, so if this one doesn't have those, maybe think about picking one up.
Someone will inevitably chime in with the "well if you can stand to look at the ugly thing" remark. I've never thought my P90 was ugly, but hey, to each their own. Besides, I'd trade functionality for looks any day of the week.