Getting a 3d sono and have a Q

Ok anyone who has had one? Just wondering if they are good at detecting gender. The place I'm going is doing a gender sonogram in 3d for us. I had my first gender scan in 2d at my doctors office ( there machine is probably not one of the best ones out there) they could not determine the gender because the baby was stubborn but he also only tried for about 2 min. Jw anyone in my sisuation and have a great 3d and were able to find out what they were having???