Anyone have any experiences (positive or negative) with this brnad, especially the newer 8.3 mm "crystal-lock" variety?  Thanks.

I installed the chyrstal click product in a rec room a little over two years ago.  Pertenant issues are three kids, and lots of friends, two large dogs, lots of dirt, and installed in a walkout basement over a crawl space.

The product is great, product support is good.  Wear service is very durable and cleans well.  My one regret is buying a high sheen  rather than a matte finish because it really highlights the dog hair, etc.  The one down side to this product is moisture.  The occassional spill or doggie accident, if not cleaned promptly ( something that 7 year olds and dogs tend not to do) will soak into the end seams and cause swelling.  If tended to and protected the seams go back down but it is an issue.

Installing, I did it myself, is a giant jigsaw puzzel, and you will be really good at it about the time you finish.  I would recommend creating seams at door ways or other logical places so you can actually go back an repair a damaged board.  Also, I used a laminate blade in a chop saw to cut.  It works great when new but quickly dulls against the plactic wear layer.  Do some homework on how the pros cut this stuff.