90 gallons holds a lot of rain! But this filled up twice with just 2 days of light rain. (Water is coming off a very large roof area.)  By connecting the hose to the faucet on the barrel we could drain it as it was filling.  I have planted Lemon Grass in the top planter to hopefully ward off any mosquitos that might take up residency in the standing water.  It is a nice sandy gray color with deep bark-like wood texture. Attractive for being so large.

Pros: It huge! 
Cons: None so far