I love my RBL 28 and I love my 20g. Inverness and I have not had any problems with them. Although I sold 2 20g. RBL's that just did not do it for me, I had no trouble with them. I knocked the back corners off on my 20g RBL forearm. They fixed it for free. My inverness went back for a relatively minor mechanical issue and it was fixed promptly. Maybe I have been lucky but I would guess people who post have had a bad experience. Few people post positive experiences because most of those are non issues.
Poorly regulated barrels on a FAIR Iside 12g that they would not fix and said 6" between barrels at 16 yards is within their specs is something I have posted but many like their Isides. So, go figure.
