I ran mini spools in both my torana`s when I had them but they didn`t spend much time on the street ,mostly old eastern creek drag strip (T1 towards T12 not WSID) or week-ends cruising.
BUt again its like al mods, change one think and you`ll most likely have to change some thing else,what works for one person doesnt mean it`ll work for you.
If you want really good knowledge of what each is log onto google and search for it. That will help you.
As for is spool good/bad thats a loaded question ask 20 people get 20 diffrent answers. I liked it for what I used it for,also had lockers in my 4x4 again diffrent types worked better than others and if used in the wrong spot they could cause a lot of damage,twisted axle and a roll over in 1 case, but in another it saved use so I could get thru and drag a couple of others to a bit more helpful area