Looks like a few questions to be answered here!
In my experience with the Strider/Buck knives, i have seen a few come back for various problems. without insulting anyone (hopefully) a large majority of them were not really problems with the manufacture of the knife but actually an aspect of the knife that the particular user did not like. The roughness of the g-10 sides is an example of this. Strider designed it like that for a specific reason, it is not a defect, it was made that way for a reason.
Of the knives returned because excessive pressure on the back of the blade caused blade play up and down, this can be remedied by using the knfe sharp side down, it cuts much better that way. If you apply enough pressure to the back of the blade, you will flex the liner causing up and down play. You can actually see the liner flex ever so slightly.
I have gotten some back though where there was an issue with up and down play in the blade, and it was fixed with a new liner. What it boils down to is if you feel your knife really does have an issue, send it in and we will gladly fix it under warrantee.
I hope this helps,
Director of Consumer relations Buck Knives Inc.
Buck Collectors club Liaison, Member #123