Having just watched a bit more video of him, a few observations:
1) He's definitely more of a fullback than halfback. Decent step, okay enough passing game, while he doesn't seem to have much in the way in terms of organisation or long kicking game.
2) He should suit our structure pretty well. He looks most comfortable out the back of a second man play which is what we've lacked with Makinson/McDonnell/Percival at fullback. He catches the ball off his chest, is comfortable hitting the face ball to the wing on both sides, and he's got a decent grubber which will stop opposition wingers flying up.
3) He doesn't look particularly fast. I'd imagine this will mean Swift will do more kick returns, as he did when Wellens was at fullback. With Lomax at fullback, Swift averaged 8 carries a match. With Wello/Hohaia there, he averaged 16.