I have a Line6 Pod X3. If you don't like spending hours and hours dialing in the right sound then Pod X3 is a good solution because you can just download the song's configuration file from the Line6 website and presto ... you'll have the exact sound you need for the song you are playing.

Otherwise you would have to master the Pod x3 controls (or any other processor) and that to me is time wasted because I'd rather be playing the guitar than playing on the processor. And believe me it has enough knobs and buttons and LCD screen options to make it a real chore real fast.

E.g. I downloaded the config file for Crazy Train/Ozzy and it was really close to the original.

I haven't used any other processors so can't compare the pod to others. Perhaps they are easier to use when creating your own sounds / effects than the Pod.

Hope it helps.