My Indigo is a rather big chain in Austria by now.
I like their veggie curry even though they still claim that they use Tofu whereas in fact it's soy chunks - which is hardly the same (taste-wise and especially texture-wise!). I remember the first time I've had it I was so confused, I thought they'd given me the chicken one and when asking, the girl assured me, it's tofu. well,...
Besides all that, I like this particular branch as you can sit outside when the weather is nice and it's a little off which helps create a rather relaxed atmosphere.
Prices (for Salzburg!) are more than ok, even though I find their sushi a little overpriced.
With the curry you can choose rice or couscous as a side dish - and if you ask nicely, you even get both :)
Food is nice, but usually lacks seasoning/spices. Also, it's prepared elsewhere and then just re-heated in the different branches. This might be rather regular with chains, but I don't appreciate it much. A friend of mine used to work for MyIndigo and after she told me about this, I'd rather not go anymore.
Conclusion: nice place, if you can't find anything else. but nowadays, there's plenty other options - even in Salzburg.
Cons: taste is a little boring, food is pre-prepared, then reheated