[99 T/A Owner]

I am gonna be getting my car retuned here in a little while once I move up there and I was wondering if anyone has some insight (and opinions) about which they prefer: the traditional roller DynoJet or the chassis DynaPack? I've always gone on the roller dyno, I wouldn't mind trying out the dynapack as long as it yeilds good tuning results, not too concerned with the fact that they read lower than DynoJets long as I get a good increase from baseline.
So let me know what your experiences with either (or if you've used both) were and how your increases on each differed from first run to after tuning.