Material Quality is the issue. German made Sigs are far superior to U.S. made Sigs. No internet myth. Questar is offering a great service by bringing them in.
Don't misunderstand, we are not importing these guns from Germany... they are actually being imported from Germany to the US by SIG USA and we buy them from SIG USA and export them to Canada from there.
A few years back we did do some importations directly from SIG in Germany but to be honest the wait times were nuts (9 + months as I remember it) and the costs were ridiculous. Just not enough volume to spread the high shipping, brokerage, etc. so cost per gun was nuts. Also, the paperwork to export guns from Germany was insane... actually more of a pain-in-the-ass than for us to import/export from USA.
As for the "quality" questions, I would have to say that I also feel that the German made guns tend to be better than the US made product but not sure that it's as noticeable as many people make it out to be. In many cases, customers are actually comparing German SIGs that were built a number of years ago to US guns being built now and assuming German guns being built now are the same as German guns that were built years ago... all things change.
I do believe that the German built/assembled guns we see the past couple years are "smoother" and better detailed than the US made guns we see... but we have seen German guns arrive with mistakes and problems so don't think the German built stuff is perfection... there's no such thing.
Also, people don't realize that on many models of US "built" guns many of the components and sub-assemblies are actually made in or come from Germany. So many of the US guns are to a certain degree partially German built. This has been a big issue the past few years because in many cases the long delays for many US made models was in fact because the US plant was waiting for delivery of German made parts and assemblies (frames, etc.)... the German production could not keep pace with the US factorys' needs and so for a couple years we were constantly waiting 6 months or more for shipments of many US models (I remember Elites as a specific example that caused us huge headaches because of wait times from Germany... even now the Stainless Elite series has a longer wait time than many other models).
I believe this was a major reason behind SIG USA's expansion the past year or two, as they tried to build US production capabilities to meet the demand which Germany was unable to feed for them. Doing this obviously results in growing pains.