yup, i used to be using 4mb streamyx, price is almost the same as level below $150 / mth.
if you have good coverage, for digi i150, the big diff is the upload speed, which is 10-15x better than the 512kbps from streamyx...
uploading photos, video is so much  faster at 10mbps... download also much faster but if you're just watching youtube or video streaming.... you won't notice that much diff, since 4mbps is already consider very good and stable for 1080p video....

yup, go change it if your coverage in area is good.... do a speedtest for digi... check it out yrself...

yeap..check speedtest for different time frame..see the speed is good or not.