They ride smoother than the Land Cruisers of the same year, but they are always going to ride rougher than... well, pretty much any other lexus ever built because of their live front axle. Just be thankful that both axles are coil sprung! Enjoy your highly capable off road rig, but understand that it's not going to be a smooth rider.
I should add that replacing the shocks after 157,000 miles of being pounded by a 5000lb vehicle should certainly help!
1997 LX 450 owner.