Hello, Hugo.
I was unaware of that drum company.
The portability; and ease of assembly
and dis-assembly are attractive. I could
have used a set like that when I was
performing.
I made very similar sets to that company's
models, back in the 1970s, when I was
experimenting with drums & sticks making.
I found that the single-headed drums had
a weak, thin sound, on all single-headed
drums except timpani and latin drums
(bongos, timbales, congas, etc.), where
the shells (cylinders) are deeper in length.
Double-headed drums have more resonance
and better tone. But, they can't be stored
one inside another. They are less portable.
Best Regards, Stay Healthy
John Broecker
The Siren of Sussex