you have to compare apples to apples 

In terms of pay-as-go structure, 9sen/MB is pretty much the cheapest you can get without any commitment. Hopefully this will spur the other providers to cut their stupid 1sen/KB model that has been applied since the stone age. With such a business model, Yes 4G is for the occasional users, not heavy users or smart phone (Android/Apple/Win7 etc) user, you can have Maxis/Digi/Celcom for that.

Come to think of it, what type of subscribers are more, data plan users, or occasional users. As such, it is highly unlikely that YES will crash and burn like P1 did. Same technology with P1, but probably 10 times less data usage, based on the monthly P1 data cap. With P1, subscribers want to 'maximize' their line by finishing their quota no matter what. Based on my half past six guesstimate, they are probably targeting the ocassional internet on phone users, or the ones that use their internet for web surfing and email only.