I would say that it is a good deal. Even better if it is the 9 shot version. Either way, the 590 is a good gun. Just be aware that you may need to replace the mag tube spring as this seems to be somewhat of a weak point, based on my experience and that of several others. Simple enough though, just buy a "standard" style Wolff spring, cut it to the desired length, shape the ends a bit and you are set.
Personally, I wish I had gone with a 590A1 (sporting a heavy walled barrel, aluminum trigger assembly and a metal safety). Unfortunately, I could not find one at the time and after buying my 590, simply ordered the necessary parts to "convert" it to an A1. It ended up costing me over $200 more vs. actually having had bought one in the first place. Oh well.
Regardless, I believe the 590 is a great shotgun. I love the "features" it presents.