Along with the Sansula's beautiful sound and mind-blowing special effects - that is, the deep wah-wah tonal modulation you can get by lifting and lowering the resonant frame onto a flat surface - there are some drawbacks among the different types of Sansula. They can be a bit finicky but are definitely worth having and playing. Knowing how to keep them at their best is easy.
The Standard Sansula (which Kalimba Magic no longer carries) sounds good but has the considerable flaw that, when the instrument is dropped from a height of 1 meter or more, its paper-thin membrane will break.
The Sansula Renaissance, with its synthetic Remo drum head membrane, is robust with respect to droppage, but if you mistreat the drum head by stretching the membrane too much, it can get a bit stretchy and soft. It still plays and "wahs," but just seems a bit tired after a few years.
And the Deluxe Sansula, with a goatskin membrane, can (in a very dry climate) get dried out to the point that the low note sounds as both A and A sharp, beating together in a markedly unpleasant manner.
But the FIX is in!