what should i look for in purchasing windflags? are the daisy wheels essential? in the few matches i've been in i don't seem to get much information from a daisy wheel, but mostly from the flag itself,have been sharing flags with a friend). is it enough to just have a ball? what other features to look for? what brands seem to be the best? how many do i need? plan to be shooting at 100/200 yards. thanks.