I'll be the dissenting vote and say that every car that i've driven that had them on there (1992 Celica, 1993 Escort GT, 1995 Civic Si, 1994 Integra GSR, 1993 BMW 325i) completely underwhelmed me.
They get greasy as hell on the track, they don't warm up quickly enough to yield a good time at autocross.
The only things going for them are that they are cheap (you get what you pay for), quiet, and last an OK amount.
If you want a real performance tire on a budget, look towards the Hankook Ventus RS2/RS3, Falken RT615, Kumho XS (the XS is king right now).
For your average street-driving driver ONLY, the ZRI is an adequate tire.