Vacuum Pump recommendations

Ok so another manufacturer is CVR out of Ontario.
I'm surprised I have so few replies. Are people not running pumps in there race cars?
I'm going to call 2 engine places I've dealt with and see what they like to use. I kinda feel that they will send me to whatever vendor they get the best deal on. Not necessarily who's best. That could be my New England attitude. But it's an air pump. How different can their output be? They are all pretty close I would think. But whose lasts the longest? How has the pieces to make it work?