just kena 2 weeks ago. compulsory if they sent you a letter. but
can opt body only or body + roof top.
benefits :
Body only : $20 diesel voucher + 10 moove points to
purchase stuff at the moove shop. abt. 30mins at braddell
workshop
Body + Roof Top : total $400 benefits - $270 diesel
& food vouchers + a bluetooth headset + 20 moove points.
abt. 2 hours
They said rooftop height not more than 1.9m, but some TDs said
1.95m. LL must take, chose body only. don't want to worry about
basement carparks in condos if kena booking. do body also good lah.
cover up the scratch marks.
majority chose body only. those who chose rooftop got very
worried looks on their faces after installation. not worth it. God
bless you if you chose rooftop. 
Who says is compulsary to do the advertisement. If they send you a
letter just throw it into the rubbish bin or insist they replace a
sonata for you. With the advertisement, it will add extra
weight and will slow down your taxi thus causing more fuel
consumption. They give you $20 diesel vouchor only and if anyone
ever wonder how much they charging company who request for
advertisement. It do not benefit drivers at all so
logically speaking, no one should be thinking of that. But sadly to
say 1 type of rice feed a hundred type of people. Somehow
there will always be driver who is willing to step
forward. Just focus to work hard and bring food home.