i had my polishing done by them last yr. Have not tried out any
other pro polishing so don't know how it compares with other pro
polishing. i was actually deciding between Zaino and Glare the
other time and ended up with Glare..
Depending on what is your objective of the polishing : eg to make
the car glossy shine, have one protective layer so you never need
to worry abt paint oxidation.. need to set correct
expectation..
if its for the former, black or darker col cars tend to appear more
shinny than other cols. anyway, for dark col cars, any
off-the-shelf polish/wax will achieve that level of shine as well.
my neighbour has a black col Subaru and he polishes himself. It
looks so much more shinny than mine.
if its for the paint protection, there is this 18mths warranty that
you can go back to them. the point abt 'no wax, no polishing
required and only need washing and road grimes floats away' may be
kind of overstatement lah. Even with weekly washing myself, few
mths after my pro polishing, noted some stubborn stains appearing
on the car surface. Went back to them to have them and 'persuaded'
them to remove them.. 
