I've had the loan of a Singular Swift over the last week while my bike (a short and nimble RM Blizzard) had some work done. I took the Swift over the same routes that I've done for years on the Blizzard, so it was a level playing field, though I came to the Swift from a position of 29er scepticism and reverence for my Blizz.
So, it was with mixed feelings that the Swift climbed the very steepest sections with greater ease than the Blizzard, despite a modest weight gain. The front didn't wander at all. And going down it was as surefooted as a sherpa, and probably a bit quicker than the Blizzard.
The Blizzard gains some ground on the flat in the fun department. It pops off every root and ledge with glee while the Swift soberly asks 'You want to do what? Well, I'll give it a shot..'. I don't think my riding style is designed for 29ers - I spend much of a 3hr ride out of the saddle and give the Blizzard a kick or two before jumps. On the Swift I was seated for most of the time and always in two or three gears lower than usual. I spent more time in the granny and less (or none) in the big ring.
But the Swift's handling was a revelation - perhaps what it shares with the Blizzard is a totally sorted geometry, a big achievement of Sam the designer. I was certainly won over by the Swift, if not totally by the 29er experience. Would I get one? Yes, so long as I could also afford some super-light wheels.
Bike: L, trim as a Russian tennis player
Rider: 6ft, tending to middle-aged spread