No, there not horrible on the street, they make a little noise, but far from riding like crap, and ive been running them for about 5 years without any "wear"
Those motorsport uppers are pretty useless to even the occasional drag racer. you are stuck with whatever the pinion angle is, and those Steeda lowers are nice from a novelty standpoint, but the average person that puts those in and dosent set the car up properly with them will end up with preload in the rear suspension, which can be dangerous at the dragstrip.
How they feel on the street could be subjective, but IMO they felt harsh and noisy. Unless you goto a torque arm or almost all heim or spherical joints there is always going to be some preload.
The OP suggests the car will spend most of it's life on the street, which sometimes means all of it's life on the street.
Can you run a drag suspension on the street? Yea, i tried it, it sucked, i had to be 10 times more careful than i did with a handling suspension.
Vibrant is right, it's a soft sloppy mess especially without a sway bar.
I'm sure some people can tolerate it, i just don't see why anyone would want to.
There are no plus's to doing it.
You suggest above that no say bar is ok if you don't drive like an ass.
What exactly are you doing on the street with a drag suspension if you aren't going to drive like an ass?
Me personally i think any powerful car run on the street should have a well rounded suspension. Unpredictable things happen on the street and i think a car should be best suited to handle all situations, not just ones that involve a straight line.