I've had a lot to deal with these as when I moved in to my office (on Jones Bay Wharf) they had no DSL.
I never had any love with unwired but I found there to be a remarkable difference between iburst resellers (some were complete crap while another was great).
You're best bet is to jump on whirlpool and see what the flavour of the month is. Then keep your fingers crossed that after you sign up it doesn't turn to complete sh!t.