I can not speak to the quality of Recretec boxes as I have never used one.
I have, however seen a .1 Madcow box right next to a .08 box from a third manufacturer, while shopping for a dry box. Seeing them side by side made the decision easy. IMO, the extra .02 thickness makes a significant difference in strength and durability.
We ended up buying a Madcow box and couldn't be happier. The welds are all clean, the construction is pretty bomber, the welded-on frame tabs with strap holes are extremely convenient, the box supports my fat ass (220lbs) without a peep, etc, etc.
Looking at the pictures on Recretecs' site
, I could be wrong, but it appears that they use a smooth piece of foam to seal the lid. Madcow uses foam rubber with multiple ridges. Much in the same way a drysuit gasket has ridges, I would imagine that the ridges on Madcow's seal woukd do a better job keeping water out...