Subway have started doing vegan meatballs (and vegan cheese) and I can't tell the difference between them and the regular ones, so I think I'll be having them more often. The vegan patties they already did are pretty good too, but they're not always available in my local branch.
I also couldn't tell the difference, although I didn't have vegan cheese.
Just in case you didn't realise, going by nutritional value alone the meat ones have more fat (16.2g compared to 12.3g) but other than that the meatless ones come out worse on each other count, especially salt. This is also true of Greggs Vegan Sausage Roll.
What I'm saying is - vegan food seems to be getting better because it's becoming really, really unhealthy