Aiming systems are for suckers.
A valid viewpoint, but an unpopular one.
If some have success, generally speaking, they are already accomplished players.
It is a funny coincidence that almost all the aiming system spokespersons were allready accomplished players before their "conversion", isn't it?
There are just too many variables from shot to shot, to say nothing of player to player.
A lot of variables in this game, that is for sure.
Lou Figueroa
I figured this post would get a lot of flack, but it actually got less than I would have anticipated. I've allready suggested many times that the problem with pool isn't aiming (as in the mental process of determining the point you need to strike and then spotting it) at all, it's "pointing" the cue and body in the right direction and then moving the cue straight in the intended direction. The general categories for these actions are alignment and stroking respectively and must necessarily be a little bit different for players of different builds and eye dominances etc...
Some aiming systems score points by acknowledging this fact, and creating psrs that actually lead you to a somewhat decent alignment (for the average person). Sadly these systems are complicating the process and defeating any natural tendencies a player might allready have in place for getting "there". Like others have allready pointed out, the hugely mechanical approach may actually take you out of the zone, and lead you to distrusting your subconscious.
Speaking primarily as a snooker player, there is just no way that I can get consistently and perfectly aligned on all long pots, swiping the cue into position from the side (for reasons which I will explain below). Believe me, I've tried. Even if the foot is on the correct spot, placing the arms and moving them individually into position introduces another source of error for me. It greatly simplifies the alignment process to step in from behind the shot, and then drop down onto the shotline. But hey, if people can do all that pivoting and get super accurate on these shots, that's great. On shorter shots, and easy tables, this may not be that big of a problem, but I need all the help I can get on those "long green" shots.
My own experiments with pivot systems showed me that even if the system got my cue pointed in the right direction, it was very difficult to keep it pointing there, because I was not properly "locked in". I do most of my locking in before I get down on the shot, holding the cue out in front of my body at "port arms" as Jimmy Reid would put it. Holding the cue out in front of me like that, I determine the geometry of the cue and bridgehand (distances and angles of my hands/shoulder/forerams). This feels perfectly natural and doesn't take any time or thought at all, it's instant.
When these are all perfect (for my body) there is a sensation of "locking in", which greatly adds to the precision of the shot. It feels a bit like shooting a rifle with a sling. While there is a a sideways movement involved in getting down on the line, the final part consists of dropping straight down. It's quite tricky to combine this with anything other than a 90/90 style "hip pivot", and even that takes a bit of practice (at least for me it did). Could you perform this "locking in" while down over the ball? Maybe, but this tends to disturb the alignment achieved by the pivoting, for me.
Just my opinion, for what it's worth.