The zoom is quite nice, though the g9.x is much better sounding (IMHO) and overall I prefer the sound of the
VOX tonelab SE for studio recordings.
Though I still think for live performance and CD production I mostly use my rig (
JSX head plus pedals). As IMHO no modeller can (at this time) replace the real thing.
I am looking forward though what zoom and Vox will be putting on the market in the future... The Line6 and Boss Modellers did not cut it for me (but may be OK for droptuned NuMetal sounds).