Mutual Funds vs. ETFs

I increasingly find myself interested in ETFs more than Mutual Funds. Mutual Funds tend to come and go and I don't want to analyze every mutual fund that someone dreams up. It's even less appealing when you know that if it does poorly, they'll just shut down that fund to hide their results. Index funds are much more appealing and in that vein I've started putting more and more ETFs in my portfolio. Now obviously I wouldn't touch a leveraged ETF with someone else's money, but I can get into buying treasuries in my brokerage account instead of going through a bunch of hassle.

Obviously much like a mutual fund, I'm going to wind up paying for things that aren't strictly the investment, but their goal is to track whatever it is they track. As such fees seem to be reasonable since they'd have no hope of doing so.