Or, work on spinning slowly, then you won't damage yourself with it I remember when people were breaking noses and chipping teeth with the old 'beaming poi': whether it's beamers, chain...
Perhaps it would be useful to move away from senient/not-sentient to the idea of degrees of sentiency.So, in terms of what most humans class as sentience, a dog would be 'less' sentient...
I've got both concentrates and flowtoys- I've not had either for long so can't offer any comments on longevity etc, but, in terms of recent spinning-both are good- very nice colours and...