i am building 4x8 boxes so they can be tended to from both sides. The better soil also lets you plant food closer together as they wont have to compete for nutrients and water. right now I have a 4x4 one up that has 12 lettuce starts, 1 dozen shallots and 2 rows of sugar snap peas in it. You do have to water more but that sure as hell beats pulling weeds. the compaction is a non issue...even a rototiller compacts the soil somewhat at the bottom. You will get what is called hard pan and thats when you have to hit it with a plow...I'm going to be building a couple more and will take pictures