I would like to know that is this event is worth spending money on? Is anyone is going to this event and have idea of it?
From what I remember, this is similar to CEX (the Consumer Electronics Expo which was held in Vegas- I attended.) From what I heard, it's actually pretty fantastic- but only if it's relevant to you.
Lastly (I remember hearing this from someone so don't quote me) it attracts the largest amount of tech-related investors; more than any other expo.
If you feel that it will provide something of value for you (anything- small networking, industry insight, etc,) than I would suggest trying to to.
If you're thinking of exhibiting, look at the list of exhibitors from last year (or call the conference and ask for last year's exhibitor list) and call them directly. Ask them whether they found value in participating, whether they're coming back again, and how they measured success (metrics).
If you're asking about what it's like as an attendee, that's a completely different vetting process. But you should be able to get information from the show manager on how many people attending are repeat visitors versus new visitors. That's your biggest clue as to value of attendance. It's not the absolute number that matters, it's the percentage of repeat attendance.