Re: logical to buy more than 1 vase??
1. The mix/match thing wasn't me. >.> can't remember that guys name, but I know what you are talking about.
2. The small KMs that thehookah sells ARE smaller gauge, so there is a difference in smoking quality. ALSO, the stems are VERY light and the trays are not the typical stamped KM tray, they are generic. If you want a real KM I would not get one of the mini ones.
3. Spare vases are always a good idea, save on shipping, etc plus its nice to switch up the vase now and again for a change of pace.
4. The small KMs have a very small vase. They are not the typical KM sized vases.
I think I have about covered everything there. ^_^