meh i'm definitely above a 6th grader when it comes to spelling like i'm texting, however i use most shortcuts out there that are common enough.
i do know some people who take it to the extreme though, like this one i got the other day:
"idts, mabe, i check out aft work, i got 1 mor, u can hav aft i get bak"
i mean i could understand it..but jesus, shorthand is short!