To add to cons, if your micd up, I've had some sound techs just pick the best sounding amp, leaving all the delays etc half full!I ran a stereo rig for about 3 or 4 years back in the 90's.
The pros: It sounds amazing. I absolutely loved it when practicing or rehearsing alone. It's easy to get lost in the swirly effects and ping-pong delays.
The cons: Most of your audience doesn't really give a rip or even hear the amazing effects. And as said before, it's alot of gear to lug around. More to set up, more to go wrong. If you play out much, I don't think it's worth it unless you have your own roadie/tech. If you're just a bedroom player, it's great fun!
well, uhhh..... that seems a bit simplistically dismissive, to me.A stereo live rig is sort of like masturbating - feels good but nobody else can enjoy your performance.