I switched to a sigma dart from a data dart bout 2 years ago, when i threw the sigmas i hated the angle of entry to the board, (flat lie) its the change you see, but the darts were going where i wanted them to go. After throwing these for a couple of weeks i grew accustomed to the flat lie and began to like it, I use the slikstik shaft and the sigma pro flight, i have used a slim flight and they land flight down, (hanging dart i call it ) pear flights bring them back up or like i said sigma pro flights do to,play around with them but once you get used to that angle of entry you will never change back, i didnt and wont, hope this helps.....