Absolutely. All of the braindump style stuff that I've seen seems to be copied from TestKing.
TestKing is worthless. The Microsoft lawsuit might lead you to believe that there's some value there, but the suit is over TestKing having the
questions, not the correct
answers.
I've looked over a few different TestKings in the past. I'd say that 10% of the answers were missing, and a good percentage were incorrect. Some of these things run hundreds of pages, so I can't say how many were incorrect, but they're pretty easy to spot if you know the material.
What's the point of studying the wrong (or missing!) answers? Besides which, some of these braindumps have hundreds of questions. It's best to know the material well, rather than risk memorizing what could be the wrong answer.
If you're looking for exam style questions for specific exams, the MS Press Readiness Review CDs are good, as are Transcenders.
Wishdiak
A+, Network+, Security+, MCSA: Security 2003