anyone upgraded from their 1Mbps to 2Mbps?

currently i'm on the 1Mbps package and i'm contemplating whether should i upgrade to the 2Mbps package?

right now, even though i'm on 1Mbps, but i'm able to get up to 1.5Mbps. i don't mind paying extra RM10 to get more than 1.5Mbps, but i'm just scared that if i apply for 2Mbps and they play around with the settings i'll get around +- 1.5Mbps then stupid already :\