Clones make sense to me...but only from a space standpoint. For example, if you're putting together a build in a 2 x 84 hp cab, it's probably not the best idea to go with a full-sized version...space is at a premium, and you need to maximize functionality over space requirements. But if the build in question is huge, then you can either choose the bigger (and usually original) versions, or stick with the formula above and have more space for...well, more.
Now, as far as QC's concerned...checking the MG Marketplace as well as the "good/bad sellers" threads on the forum is very useful. If you see a builder that appears to be a "problem child", then don't buy their stuff. Keeping an eye on whatever Muff Wiggler's calling itself at present is also very useful, given the concentration of modular users there as well. Between here and there, you should be able to find out about issues, should they exist.
Also, some stuff just LOOKS like refried ass in general. This sometimes indicates that what's behind the panel is substandard...but certainly not always. Noise Reap's stuff, f'rinstance, does have a rough look to it and one might be tempted to give it a pass...but that would be a mistake, since Noise Reap's cooked up some amazingly useful (and sometimes amazingly twisted) circuitry that most anyone can get an excellent result out of. So as far as they're concerned...they're doing something right, so take what they give, ugly panels and all. I wouldn't want them to change ANYTHING. And there's plenty more examples of this out there...
Again, this all gets back to the old "caveat emptor" issue...if you're going to be a customer, be an INFORMED one. Do the research, see what others say and have experienced, THEN proceed.