Digi plan is low, but if you considered the iphone price compared to maxis, you are saving about the same amount.

i compared with maxis 1 year contract 32gb iphone.

maxis (ivalue 1)
iphone price = 1990
12 month rates = 1200
thus total = 3190

digi 88 (mind the 2 year contract but for the sake of comparison i'll just do 1 year plan)
iphone price =2490
12 month rates = 696
thus total = 3186

so with digi, for 1 year (and you have to serve 2 year contract), you save rm 4 compared to maxis 1 year contract.

not to mention, with maxis, you get 133min more airtime.