I stay away from ETF's. I've done enough tracking of them to note they skim off the top. Watch something you can track like oil or gas, then watch the ETF, you'll find the ETF lags the actual index. Only one I'll touch is the Spider, that's just a cheap version of an index mutual fund.
NRZ has done alright for me. I think my best ever was BOX that got bought out privately for a big gain. Many years ago made a huge gain on $NM, but lost much of it back in VLCCF