I used the POD XT Live for a while........
Great digital modulations (quite obvious but still......), not so great distortion/overdrive.....
Actually if you play old skool rock like GNR and Skid Row I'd suspect you'll probably be underutilising a multieffects pedal since that genre doesn't actually require that many effects. A good OD, distortion, wah, maybe a chorus or some other modulations and you're pretty much set. Though if you want versatility and ease of use multi-effects is really the way to go....