JJ,
I've had numerous Beretta O/Us over the last 30 years or so....dedicated target guns and hunting.....12, 20, 28 gauge and one 4-barrel skeet set.
I've had Cole upgrade a couple hunting scatterguns with DTs, et al.
Tank, as in tough....not in weight, as a given.
I prefer them for many reasons....tho I did have one skeet gun in 12 that pounded my cheek and I never determined why.
I would still trip that way but hope I am wise enough to realize that other makes will certainly fill any bill.
Mirokus are good guns but, most often, are especially solid values in $$$s and use, dependent upon condition of course....as in my comment.
Weight, years ago or now, is largely an unimportant consideration to me unless at an extreme either side of middlin', as noted by the Ruger serving as an appalatchian grouse gun for many years.
It may be so for others, or not, which is why my initial comment on what the OP would be advised to consider shows.
I repeat, scattergun choice and most all that rides along, is waaaay overthought.....pick what feels good, looks good and makes you grin....it will be stuff that works.
Beretta are indeed "stuff that works"....so are almost all other scatterguns.
http://youtu.be/5Ot035kSVt0