I was wondering if anyone has used the booster and if so does it work ok. I just bought the 10X42 ELs and was thinking about getting the booster. Does it come with one or two eye pieces and if it comes with only one eye piece is it hard to look through and do they go on and off easy and fast. Im looking for the added power without spending a lot of money for now. With the booster iwould probably need to use it of a tripod right.