Not sure if the hub setup is exactly the same for the HEDs as for the old specialized Trispokes, but my trispokes wouldn't be a terribly good idea for the rear on the street-- there's no way to put a lockring on. It's a standard 1.37x24 thread for a freewheel or cog, and to get the chainline right you have to have an adapter that just threads on. Even if the adapter could take a lockring to hold the cog on, it's not set up for any kind of lockring to hold the adapter on. It's fine on the track where you don't backpedal, but could make you really unhappy on the street.
The wheels themselves are pretty tough. They were made for use on track and road racing/crits, though I don't think they're mass start legal on the road anymore for UCI events. I've crashed mine on the track a few times and they're just a little scuffed.