I love the semi-auto Shotguns. I started with the Sweeper (8 round) and loved it. Then moved onto the Piston (auto), and didn't like it as much. Then i bought the Claw (PA) and hated it. Now i'm using the Mauler (6 round semi) and i love it equally as much as Sweeper, maybe more. The full-auto isn't bad, but i think holding down Mouse 1 to auto-fire with a shotgun is bad for your aim. Why? Because in a tense fight, you hold Mouse 1 and try to keep your crosshair on your opponent. This makes sense for high ROF weapons, as when youre crosshair does pass over the enemy, its likely a bullet will be firing at that time. However something that fires a lot slower, it doesnt make as much sense, as in a tense battle, your crosshair may only be over the opponent 25% of the time, so it's a lot less likely that you will be hitting with blasts. Compared to a semi-auto, i find it a lot easier to react and click when my crosshair is over the opponent, that 25% of the time. I get that you can click per shot with a full-auto, but even so, i found myself holding Mouse 1 in tense situations. I'd still often get the kill, but i'd churn through a lot more ammo.