He's notorious, always one of the toughest of the year. The expert solvers love him but I find him unfair most of the time, mainly because you normally have to virtually cold solve 3/4 of the clues, which are tough, before you can get anywhere.
This looks like it may be slightly more approachable than some of his others but will still likely be about 10 hours of frustration then giving up about 2/3 of the way through with a solid brick wall hit, which is my normal experience with Sabre.