I don't want to sit here and brag, so the numbers are just going in here for references for anyone viewing.
My first LSAT (Before doing this): 155
My September LSAT (After using this service for about 3 months): 174
I wanted to thank 7Sage for helping this improvement happen. It's huge, and this is a service I will always recommend because without it, on my own, studying would have been impossible for me. So, thank you for the help! And thank the discussion posts that made a great community!!
TL;DR: Do it. You have nothing to lose if you do score preview and everything to gain.
So, from my point of view (for what that is worth) is that if you think you could do better (your average is higher than your actual test score, or you just know that the August test wasn't what you wanted) then retake it... I mean if you are already signed up for the September, like I am, then why not? We aren't getting our money back for it at this point, so might as well take the chance to improve!
Worst case scenario is that you do worse (Lets hope you decided to get that score preview) and you cancel the September score. It'll be like you never took that one and you ride with the solid scores you have!
I know it is a 3 hour dump of time that you won't get back, but my thoughts is that it is worth it if you improve even by 1 point. But take that with a grain of salt coming from someone who is in the same boat as you! 1 point isn't much but think about it this way: you got waitlisted. It's April, and they are running through the leftover slots. Your fairly matched with someone else, then that 1 point could be a difference maker. And if you don't get it on your next real test, then it is what it is, you still have a solid fighting chance! But I always look at it as being able to knock the competition down a peg any chance I get. Give yourself the advantage out the gate, because right now that is what we have going for us is the ability to improve this score.
For me, GPA is locked down, not too much room for improving that given that I graduate in December. So the only piece left that is easily graded is the LSAT. I can improve my other pieces like essays, but the LSAT is truly the last graded event that can be improved. Why not give it a chance. Shell the $45 bucks upfront incase it comes back and you had a migraine through the whole test, but on the off chance that it comes back and you knock it out to gain yourself a point or a few, then it was all worth it in the long run.