Done @140F, sous vide style, for 17 hours. Next time ( and for sure there will be a next time ) , I'll cook at a temperature bellow 140F.
The texture was... very interesting, a little like a meaty sponge ( in a good way ). A little dry, but after pouring sớm of the juices left in the bag it was cooked in, it was superb. I ate about 2/3rds of the 2.5 pound roast myself