I had that saddle for a few rides. Gave me some numbness as well. Groin numbness is not something I am willing to put up with hoping it will get better in a few hundred miles, so I ditched it. I have a Brooks on my commuter, and find it to be less comfortable now than it was when it was new. So overall I don't have a very high opinion of "breaking in" a saddle. After your first 50 mile ride, you should know whether it's going to work out or not.

Next time I'm in the market for a new saddle, I'll probably do something like Competitive Cyclist's saddle demo. It's $75, which is pricey, but beats buying a $150 saddle that you can't stand.