Yea, I have never been able to find a comfortable bicycle seat for training. I have tried several seats but always get numbness and pain... some say that you just have to tough it out and you'll eventually get used to it. I don't see how...
One nice aspect of the Street Strider and the ElliptiGO; is that you stand up and are more elevated which makes it easier for traffic to see you; and it is quite titillating to go swooping down a hill at speed while standing straight up and elevated like that. A nice adrenaline rush. Makes me feel like a kid again.