I'll chime in-a 1300 Defender (identical to the one in the top picture but with darker wood) was maybe the first shotgun I bought with my own money, boy did I lust for one of them at the time. It was the first high-capacity shotgun I'd ever seen tbh, and we're going back a couple decades+ now probably? Anyway, I only kept it a few years, probably left the house less than 10 times and only in the first year or so. Reliable? Yes, but that's the best thing I could say about it.
The rotating bolt design/"speed pump"=didn't know the gun had this feature and I didn't like it or get used to it. A bit unnerving to use, and I wasn't new to shotguns. You can Google the mechanics if you're feeling it, but basically the moment the round goes off the bolt unlocks and will travel rearward to initiate the cycling process for you. (maybe not describing perfectly?) If you knew nothing about it and took a shot, you might think it's a pump that's trying to auto-eject the empty or something. I remember disliking that so much I'd try to force the pump forward on firing. You couldn't really have much authority over it, or that's how I remember it.
Buttstock felt too big @ the wrist=too chunky in my opinion, and I have relatively large hands. Functional, but a real mitt full.
Buttstock/receiver fit poor=stock was proud of the receiver by a visible amount on the both sides, and worse on the top.
Cycling wasn't smooth=this is trickier to describe, but mine almost felt like it was binding a little? Meaning, the pump stroke seemed to require a little too much effort to initiate, THEN complete the cycle stiffly, but normally. It wasn't binding, but in hindsight might not have even been broken-in?
In those days, I didn't know shotguns were made of anything but steel, and was disappointed to learn the receiver was made of aluminum. I got over that pretty quick, but found the finish on the receiver so glossy and smooth that it always looked smeared with finger prints. It's an aesthetic thing, so subjective and not really a measure of how good the gun is/isn't.
Had some fun days shooting with it, and the experience left me knowing what to look for if I were to consider a different shotgun one day.