Only just started this but what struck me straight away is what a fantastically slick and quick game engine they use. Quick screen load times and fade in and fade outs, whilst still there are fast and smooth. A joy to play. Contrast this with a couple of other games I've played recently (Cognition, The Raven) which , whilst I enjoyed them they are somewhat spoilt by their engine.
The Raven, which I really enjoyed was marred by being a resource hog. I had to turn the resolution down to the minimum and even then it was awful, with p.a.i.n.f.u.l.l. screen load times, sloooow fade in/fade outs and sluggish performance in general.
Cognition, again I've enjoyed the episodes Ive played but the engine was a bit ropey. At times some really bad animation. I always put this down to the fact that it seemed to get it's production values from the casual genre rather than the traditional adventure.