People who play by feel still have a system to aim, they just don't conciously acknowledge it. There is a difference in playing by feel and playing completely by memory. I play by memory when I am out of stroke and not concentrating. I aim at the OB the way I remember is the right spot but I can't really 'see or feel' what I am aiming at, and as a result I miss the shot half of the time. When In stroke I play by feel, but this is a combination of memory, concious aiming, and feel. This is when my game is at it's best. The strange thing about me when I am in stroke is that my aiming is done backwards, I don't know why. I visualize a line that the cueball is going to follow after the shot is made, and I adjust my aim to that. It's like I'm aiming my position first, and then the shot. When I am struggling, I can't focus and I don't see any line, everything is kind of fuzzy and this is why I believe that I just play by memory when I'm out of stoke. I think that aiming systems really help boost one's concentration and can help you stay in stroke more often. The problem with the aiming system that I use, is that on the days when my stroke isn't in line, the system doesn't work at all so I abandon it. When I am stroking straight, it hasn't failed me yet.