are all the 590's heavy or is that just the A1?
just hefting them the coach gun weighs less than my stevens 350 and about the same as my 500.
if you are still considering the coach gun a few things you should be aware of: the standard models come with a plastic butt plate that does no one any favors in terms of recoil, might want to replace it or grab a sip on pad right off the bat. the safety is auto engaged whenever the action is broken, some people really hate this. you can disable it pretty easily i'm told, but i just practice sweeping the safety as i shoulder.
i wish you could get it with ejectors but all in all it's a fun little gun.