Chips are on-par with oven chips but a little mushy. Not quite as crispy.
You can choose from four sauces, the one I had (pictured) was garlic & aioli which wasn't too bad. Sorry can't remember the other choices but here's the full Fitchips sauce list (though Subway doesn't stock them all).
I admit I was skeptical too regarding the health aspect. I likely won't be buying them again as it's not great value, if you want decent chips you may as well go all the way to other fast food such as Maccas, KFC, etc.
As for my favourite Subway toppings, I like my usual. White, all salads, mayonnaise with mozzarella cheese toasted.
Indeed indeed!