I see one on ebay. It looks like a generic Chinese folding bike. It will get you from A to B. What sort of riding experience do you have?
Plenty....years of traithlon and mtb riding. My main concern with getting any folder (I'm looking at the Giant Expressway too) is whether or not if folds small enough to take it on trains (..or sneak it onto buses). Also whether the weight is reasonable to haul it in and out of stations etc. My commute would only be a 4km ride to the station followed by another 4-5kms from my destination station to work. So not far.
Parts are easy enough to upgrade...to something higher quality I guess....but the frame/bars/forks need to be rigid, not flexy.
There are certain rules about folders on buses and trains. Not sure about Syd, but here in Melb, the bike needs to be covered for bus travel. Syd trains are a bit crowded but a bike that size will be OK in the vestibule I guess.
But my main concern is the bike will disappoint you. It is extremely generic with bottom of the range componentry. The Giant is not much better.
I cut my teeth on a bike like that. But I upgraded it soon after getting it. 9 speed. Ended up touring around Tassie with it.
The gearing range of the bike you have in mind is pretty basic too. 14-28T in the back, with 46T in the front, and small wheels, you'll see the gearing is way too low.
Weight wise, it'll be about 12-14kg. Foldies are rather heavy. But it will easily do the 2x4km, that's for sure. And it will be quite flexy as well. Those frames twist quite a bit under pedalling torque.