I know one local XJ'er who did the No-Slip for the very reasons you entail, and then he drove a Detoit equipped XJ and said he would have just done the Detroit had he known.
I've been very conservative towards preserving road safety and limiting unpredictable behavior, and I stayed away from a Detroit for years because of this. I was overly conservative in this case (although if you have a five speed you might really hate any automatic locker). You have to modify your behavior around town with any automatic locker (no mashing the throttle around turns), but for everything else it is no more noticeable than a limited slip.
I would do the No-Slip for two reasons only: 1) it costs less, and 2) you can install it yourself, which means it is under half the cost of a Detroit.
In return, you give up strength as you are limited by the stock carrier, and the No-Slip is a more complex mechanism in terms of reliability.
But as far as streetability goes, I don't think it matters a bit. You'll have to adapt to either one a little bit, and neither adaptation will be anything to the degree of what a tall suspension lift does.
Nay