REI is great. They do a lot of R&D each year to be sure that their store brand is a valued competitor. I'll also add that even though a good rain fly is waterproof, they are also coated with a DWR (durable water repellent) coating most times, to be sure that water beads up and rolls off. Just like anything else with a DWR coating, this will wear off. Buy some ReviveX (the laundry kind works best), or any comparable version (I hear Nikwax also has one), to re-coat this feature when it wears and lets water stick, or, worse, allows the material to "wet out." Many times, people confuse condensation with water leaking in; the better the tent material, the faster it will dry, and the more it will breathe and prevent condensation, just like technical clothing.
