This side conversation was split from HERE. jbizzle
Another advantage of the K-2006C box (it is taller) is that when refill time comes, 2 oz. reagents can be bought for much less per unit volume than the .75 oz. or 1 oz. reagents.
Of course, if one tests infrequently enough not to use more than .75 oz. or 1 oz. of some reagents per 12-24 months, they should purchase accordingly.