Sync-ing Issues with FX releases???

[Rorschach]

Hello.

I'm brand new to these forums and I was curious if anyone had any sync-ing issues with any of their FX sets. Sync-ing issues would be audio and video (sound and picture) that don't synchronize, which means the audio either leads or lags behind the video. I was just wondering if there were certain sets notorious for being synchronized poorly or if its just a crap shoot as to whether you'll get a bad set or not. From what I've heard, FX is one of the best Hong Kong discount companies, so I'm sure there are plenty of other problems with other companies releases, but since I was planning on purchasing some FX releases, I was wondering if someone could fill me in to which sets I should probably avoid.

These are the sets I am purchasing:

RahXephon (TV series)
Haibane Renmei
Vision of Escaflowne (TV series)
FLCL

Please help me out and tell me my chances of having sync problems.

Thanks in advance,
-Rorschach-