The reviews, and comparisons, for their 1/72nd scale series of Lightnings were very good. Both manufacturers came out well, but the Sword kits had the edge, as the price was virtually the same as Airfix, but with much more detail, especially in the cockpit, and the jet pipes.
From what I've seen, they've come a long way in moulding quality since their earlier kits. I have their 1/48th scale Auster which, while being good (to look at, not tried a dry fit yet), is fairly simple and basic in the mouldings, and not a patch on what I've seen on both their Lightning scales.
I'm sorely tempted, as I've wanted 2 seat Lightning for many years, but I've literally run out of room even to store kits, let alone built models, and, by the time I've built them all, I'll be well over 70 !!