I'm curious why people trust apps published by banks/credit unions instead of using the substantially similar web pages with a trusted browser and password manager. I've seen a mix of anything from awful to OK from mobile banking apps.

My only use case for apps is mobile check deposits, presumably because asking for camera control on mobile devices was beyond the ability of their web developers.

iPhone:

  BoA - 457MB
  AMEX - 130MB
  USAA - 109 MB

I only have BoA because I haven't canceled my CC with them yet (kept because AMEX is not accepted everywhere). It seems I deleted my other bank apps (after I'd closed the accounts, makes sense, right?) but IIRC they were somewhere in the 150MB-200MB range. Some people just really like bloat I guess.