We have traditionally used 1/2 oz cu in our designs and are considering 1/4 
oz on some new designs (density issues).  Are any of you using 1/4 oz?  What 
min trace/clearance are you using.  In rework, do the pads lift off?  Any 
special concerns in manufacture??  Is cost greater/less than 1/2 oz?  Special 
handling problems? Etc etc etc???

Any input would be appreciated.

thanks

gary ...