I used this for roughly 2 years.
My advice is, to check first for the coverage, namely your residential house and your workplace. In the beginning, the coverage was amazing. It used its own LTE coverage while piggy-riding on Celcom's 3G network. But once 3G was gone, the coverage was damn terrible.

not just the network, the call signal is really bad too. So eventually, I had to move to Digi. Unifi Mobile really gives the best value, IF you can use it. If not, it's totally useless.

My advice is, don't commit to the contract. Perhaps try it first for the first 2 months before deciding. Good thing is, that they offer non-contract plans at decent pricing.