I got a Zoom G3 last week from Guitar Store India for ~12700 with shipping. The device is pretty intuitive to use and quite rugged in construction. Since i am a beginner i can't really say how it fares with other pedals but the tones are better than the previous two i have had in the past (Zoom 500 MkII and Korg AX100G). The Metal type tone one can get are also better than my Spider 15's Metal and Insane channels. Although there are only 3 slots available on it, i use the Reverb/Tape Echo from Spider so it frees one slot. Apart from this i have a Behringer US600 which i plan to use in chain with the G3 for pitch shifting. The pitch shift effect on G3 always mixes the shifted and original signal so it's no good if you want a dropped/raised tuning.
This has been my experience so far with the gadget. If any one of you have the same do share your patch settings.