I've been w starhub since 2010-ish, when i was in jc. It was the cheaper option then, and i stuck to it out of habit. Then when i started work, the corporate discount was 30% so it's a pretty good deal for me to carry on. I've contemplated switching to a sim-only plan but upon calculation, it was cheaper for me to renew my corporate plan and get a new phone (s7 in 2017) along with it.
My home wifi which is also under starhub has problems every now and then, but at times like that I'm thankful my data still works fine. Connectivity is intermittent sometimes when underground and in lifts, but it seems to be a common problem across telcos so I'm not too hung up on it.