I’ve had the ultra, great gun but low shot count. Had the 410, nice but fiddly magazine. Have got the HW100 T, excellent gun and shot count, bit too long for stalking in woodland. Have got the HW100KT, excellent gun, good shot count (5 magazines, it has been to Blackmax for a tune), brilliant carbine. Have got the Scorpion SE, excellent gun with good shot count (70+),good length even with HW mod, but not as accurate as the HW100KT.
I’ll always reach for the HW100KT, 14 shot mag, Quick and fool proof loading. But the scorpion is a very close second.