You can always just take Unifi Mobile prepaid to test the connectivity first, once okay, then only you decide whether to port to Unifi Mobile Postpaid or not.

My experiences...

When Unifi Mobile first launch (still called Webe at that time), I have to use Webe as my secondary lines while remain my Celcom as my main number, as at first, Webe have coverage, speed and SMS problem...

But now? While coverage still an issues, I quite satisfied with Unifi Mobile now, in fact I already terminate my second line and ported my Celcom to Unifi Mobile.

Heck, coverage even not an issues now when Unifi Mobile is cover by Celcom 3G and will be 4G in the future.

Btw, go for the 99 one for unlimited everything!