I have a Beneilli 20Ga M2/Synthetic/Comfortech stock. Nice little shotgun. Easy to carry, mild recoil if any at all. I truly like the adjustable stock (shims); makes it point where I'm looking.
HOWEVER, mine has been a testament to Benelli customer service. Bought in 2012. One trip t0 SD and it went back because it was rolling the leading edge of the brass on the hull when it chambered a round. Also, it would feed an extra round out of the magazine tube, jamming up the works. Benelli was running their "No Excuses" adverts at the time. Asked for a replacement shotgun...no excuses! They of course said no. Boxed up, sent to Benelli. They hand adjusted (filed) the chamber; it no longer rolls the brass. They trimmed a coil off the magazine spring; it
rarely double feeds now.
Next season, 2013, I walked a tall native sunflower patch, with the flowers tugging at me all the way. When I came out the other side...no recoil pad! The flowers had pulled it out of the cage that holds the pad in the comfortech stock. Called Benelli after I got back; the sent me a new pad. Good customer service. They advised me to use some Gorilla Glue to hold the pad in the cage.
A few weeks ago, I took it out of the heated (Goldenrod) gun safe and shot 150 rounds of various clay. The replacement recoil pad, now 6 years old, started crumbling into tiny black bits of padding. Looked like pepper flakes. Called Benelli, sent pictures by email. Two days later, new Gel recoil pad. Good customer service.
The newest problem which I first noticed when shooting the clays was that the comfortech stock was getting "sticky/tacky". It's almost like pine tar tacky. I have never used solvents on it, in fact pretty much never put anything on it at all. Occasional rain maybe. I've have washed it in Dawn dish soap. Seemed to make it worse. I tried a bit of GoJo; that cleaned it up but a couple days later it was tacky again. Tried rubbing alcohol. That has worked the best but it still seems to return a bit. It's going to SD anyway; I shoot it too well to leave it home. But when I get back....Benelli customer service again. I have read online that they did have some tacky stock problems around 2012. Maybe mine was slow to develop.
Summary. I really like the shotgun. Benelli customer service is great. Unfortunately, I have to use it too often!