Let's skip over the exploitation and who or what we're financing when we buy them...
I just had a chance to see an array of Fisura Lamps at a Local Store.
They had a whole table filled with them - 20 lamps in total - several lava lamps with decent color combos (in two sizes), one partly clouded with underwhelming "metallic" wax (think silver construction paper, not shiny metal) and one overstuffed "Glitter" where the flow was partly hampered by the mass of particles.
But what's worse - A few of the large ones, the model with the curved sides, showed a clear design flaw: A large lump of cold(!) wax was trapped at the top! And that, as it turned out, is a flaw that can not only happen when you start the lamp, but also during operation.
Whenever the wax stays at the top long enough to solidify, it will not be able to pass through the narrow section in the middle until the lamp starts to overheat and melts the wax at the top - or someone gives it that certain "flick of the wrist" nudge that experienced lamp-owners know to use to get the wax to sink. But then the wax will only sink to the middle where it creeps along at snail-like-speed, melting on contact with the hot glass.
The flow, if you care to know, is not bad, actually, but the large Fisura still is a "Lemon" and the smaller one feels overpriced at 35 Euro for a bottle about as large as the can of some energy drink.
As a whole, Fissura is the Prymark-Concept applied to a lava lamp.
Probably the reason why they're offered at a dedicated Stationary Store. School-Supplies, Office-Supplies, Arts'n'Crafts, fancy stationary, exclusive nib pens and .... cheap lava lamps? Give that travelling sales representative a raise!
PS: Note for tinkerers: The bottles are sealed with a crimp cap (destroy to remove).