I have no personal experience of this but a friend of mine got a Concord-looking saddle after becoming extremely concerned with numbness (he's an Ironman type of guy, spends 5 hours on the trainer on a regular basis). He tried many seats and his standards were quite high. This Concord thing has a sloped nose in the front and the "cut-out" is actually going to the end of the saddle in the back. My SO has been looking at a similar saddle (the SLC by Selle Italia I believe) which doesn't have the sloping nose though, and the bike store guy had good things to say about it for long-distance riding, too (but he didn't mention the aero position).
Fizik also makes a tri-specific Arione, but interestingly it has no cut-out. (None of their saddle does, I think they think it's just a fad. They could be right, who knows...)
I found the Jett very comfy when I was in the drops (that's as close as I get to "aero"), unfortunately in the meantime it was biting my bum so I got rid of it. I'm still saddle-shopping so I'll ask specifically about that next time I spend an hour in a store considering different seats!!!!![]()