They say an ounce on the feet is a pound on the back.  These are a bit heavy by competition "racing" standards but they are comfortable.  I mostly use Inov-8 mudclaws recently and I admit to having dozens of trail running shoes.  My thoughts on speedcross vs Inov-8 trail shoes, offered with thanks for other reviews that helped  me make good purchases here at amazon:
Pros: 1) Love the lacing system, it works  2) Very comfortable, no hot spots, great padding  3) No junk gets in the shoes, the mesh is tight 4) I like the elevated heel going up the hills but not so great descending. 5) The sole sheds mud better than most of the other trail shoes I have tried.
Cons: 1) Poor feel of the ground vs other shoes, I rolled my ankle twice since i have had them and very rare with Inov-8 shoes which give you much more feedback from the terrain.  2)  Grip is OK but not on par with Inov-8 mudclaws  3) Weight, but you get a lot of shoe, padding, and rigidity for that weight so maybe not a fair criticism.  Hard to pass up on a training day but not the shoes I would pack for a race when connection with the ground, grip and light weight are most vital.