on my first diagnostic test with testmasters, i scored a 150. after studying half-assed for about a month, i raised my score to about a 157 (on another practice diag). i decided upon finishing the course to take the lsat a year later.
the following year, i enrolled into testmasters again. this time, i studied like a madman, raised my score to about a 163/164 (on all of my practice exams), and ended up with a 165 when i took the real thing.
i think if i had studied more, i could've been able to raise my score a bit higher. but, the lsat's done and over with, and i'm satisfied with what i got.