I find the ride pretty soft and in my more limited experience slamming depends a lot on the conditions and how the helm / cox is driving.
I moved from owning 18 to 20 and now to 24 degree deadrise, but also changed the boat length - lots of variables. The 590 is certainly the softest I've owned, but go try others - Ribcraft, Ribeye, Humber and Redbay all get good words said on here.
I like the Alu hull for its lightness (launch, recovery & fuel eff) and hopefully it's durability. Lots of folks do their own hull repairs and maintenance and prefer GRP.
Sorry I'm not being definitive here but it is a personal choice and I do think you should try a few others plus the 540 to make sure it is right for you.
I could be talking bollox so will wait for the Ribnet massive to comment