SOme of the newer 4 digit Tartans are designed such that one can change out the keel in a simple fashion. So if one were to buy a deep draft as is typically speced here in the puget sound region, and you sail to a shallower draft region, or move it too, you can get the shallower draft keel installed easy enough. Personally, I can not think of ANY advantages to a shoal draft. But that is from some one that is typically reading "---" on the depth guage! ie too deep to read! Then again, maybe if I was on the east coast, I might thing differently. I personally will take the deepest lightest keep I can get! Makes you faster to some degree, may not be a lot, but it is faster none the less!