Hi John,
I buy ETFs when I need to get invested in a sector or group quickly, but then I look to trade individual stocks. I like trying to trade the peaks and valleys in individual stocks, but that's just my trading style - it's not for everyone.
In this case, I'm already fully invested in juniors, so I won't be buying the ETF. I'm taking a slightly different tact with this. I've bought a large selection of juniors most of which are too small to be in the ETF. I'm hoping the ETF sparks new interest in juniors from American investors, and that will lift all boats, canoes, dinghies, rafts & other flotsam and jetsam (at least long enough for me to sell at a profit).