Anything approaching 1%. I'd aim for ratios below 0.5%, Vanguard offers excellent funds in the 0.4 - 0.6% expense ratio range. You pay that fee whether you win or lose, so it's a big factor in selecting good index funds to invest in.

Grossly incorrect. You say that it's 'common knowledge' that keeping a mortgage is a good financial decision. You know what else is common? Being broke :)

Always a concern, but one we take seriously. More here: https://www.feex.com/security. And of course, you can also use FeeX anonymously and list your investments manually...

For those folks who are curious how the service plans to make its money, considering it's free, I asked the developers and they mentioned that their long game is to expose fees in lots of different products, not just retirement funds - they eventually want to do 401(k)s, insurance providers, credit cards, checking…