Long post, but I wanted to offer up some of my experience with Benellis over the last 20 years in that I thought some may find it helpful. I've had 6-8 Benellis, three of which were SBE3s. plus have shot friend's guns and used borrowed guns on bird hunts outside of the USA.
Through a couple of different decisions, I ended up with no Benellis a couple of years ago, which was a first in many years in that my M2 had been my primary hunting gun since around 2005, I think.
To replace my M2, I thought I would try something different and after reading a lot of hype put out by Internet personalities about Retay, I bought a wood-stock Masai Mara 12 gauge. It was a real disappointment and I really had heart burn in that I could've bought a Montefeltro for a little less and the Monte for me functions a little better and in my opinion has better fit and finish and better wood in the instance of my latest Monte, a 20 gauge. Though honestly, I probably didn't give the Retay a fair shake in that I was disappointed in that I felt the gun that arrived didn't live up to the hype. I felt conned because I bought into what I read on the Internet. Overall, I think the Retay is an OK gun but priced about $400 too high for what it is (though, I've always thought Benellis were priced high too for such a simple design).
Benellis have not been without issues for me but no more so than any other brand of gun. One of my SBE3s was an early gun that shot a little higher than I like. My first M2 would not consistently feed some cheap, steel-case head ammo, which was remedied by Benelli and then a gunsmith opening up the dimensions in the receiver. After that, the gun got hunted for 20 years and is still in use with a friend. Though eventually remedied, that M2 produced the only malfunctions I can remember ever having with a Benelli.
Since selling the Retay this year, I've bought a 12 gauge M2, a 20 gauge Montefeltro and a SBE3.
The M2 has exceeded my expectations and got hunted hard this year. It shoots exactly to the point of impact for me out of the box and has massacred ducks this year.
I patterned the SBE3 when it came in and with the factory shims, it was centering the pattern a couple inches high (maybe advertised 60/40) and shooting left (around 80/20 left). I pulled the shims and flipped the shim for cast (I think it was set up from the factory for a lefty for some reason) and installed the lowest shim for drop. It now shoots pretty much dead one for me with a nice centered pattern. I really like the weight (7 pounds exactly) and balance of the gun. It is a little more weight forward than an M2, which is a good thing for me. I've fired a few hundred rounds through the gun ranging from 1-ounce, 1200-fps Clever target loads to 3" steel, lead and bismuth and have yet to have a malfunction. Looks are a secondary consideration for me on serious hunting gun, but it is the tungsten Cerakote and Optifade combo, which I think it looks great. It is as close to a do-it-all shotgun for me as I've ever found.
I've been busy hunting and have not yet fired the 20 gauge Montefeltro but when it arrived, I was impressed with the fit and finish. It even has nice wood. Both the buttstock and forend have fiddleback throughout which shows through the factory stain. I don't remember Montes having wood this nice but this one does.
Overall, I've been really pleased with my Benellis though I know like any gun, they are not perfect. I think they are overpriced but generally function really well. I prefer an inertia gun for hunting, and have yet to find anything that works any better for me, though I'm a constant tinkerer and still looking. Your mileage may vary in that many prefer other guns, such as Berettas, Brownings or whatever, and I like and use many, but for serious hunting for now I'm a Benelli fan.
Hopefully this is helpful to someone.