Upgrade now! With the flat replacement, I doubt you lose more than an inch.
I agree. Personally I would get the Alpha because of the versatility. However from a pure storage perspective the two separate smaller compartments mean you have to fit smaller items into both rather than having a larger drawer. I think there are better storage options if you're going with a two drawer side by side system that are cheaper. The Alpha is what makes the Trekboxx magic. Either way, both are too rich for my blood and I probably won't be getting a Trekboxx system