I have a stick of Apacer PC100 CAS2 that is really stable, occasionally has difficulty posting at PC133 CAS2, perfectly stable at PC133 CAS3.
Since thats the only one I've personally used, I can't say if the whole brand is good, but if Gunbuster has had a lot of them go bad, see if other people in the industry have a similar opinion. I'm a tech too, but I usually just deal with Micron or Infineon, and have a very low RMA rate with both.