Default my new ZL

hello guys i bought this ZL last night....
and as i open it it pops out from 4.1 to 4.2 den after it goes to 4.3....
now it pops again with other stuffs to update to together with 4.4kitkat...
is this update all?
and is this mobile good for heavy usage of surfing... music... even if a single chrge a day???
pls help... thanks..coz i can decide if im gona buy Z or stick with this ZL tnx....