I have two Wolf Packs, two Plano Hunter storage and one AluBox. Also a Pelican but it is for indoor small electronic storage - Laptop, cell, GPS, etc.
Plano were inexpensive, picked them up at Academy Sports for $28 apiece. Have been all over NM, CO, WY, MT, ID, TX on my roof rack over two years. A little taller than I would like, but they work well. Upside - plenty of storage, tie down points for straps, easily stackable when not in use, so far have been waterproof from rain/snow but wont if submersed. Downside - slanted sides make square storage items take up a lot more space.
Wolf packs are near perfect. Waterproof thus far rain/snow. Price is like AEV...no discounts but I did pick mine up at an RV show. Upside - much more square than the Plano, compact size, prefer the height on the roof rack, stackable for non use storage. Downside - smaller storage space than the Plano, a bit more expensive.
AluBox is expensive but worth the price of admission. Id buy more but I have other priorities in spending right now. Upside - perfect roof rack size, water and bombproof, look like proper kit and will outlast the others by a long margin. Downside - sticker price.