As I'm now a bit weight restricted in what I want to manage I looked at these recently prior to finding my 26kg 9.8 2-stroke. This particular Selva model is pretty light at some 7kg less than other makers 2 cyl 4-strokes.
So despite being sorted myself be really interested to hear more of them.
Sounds OK in this video but I have read comments they are a bit noisy.
They also do an interesting elec start version with integral battery under the cowl which I believe is no more heavy (or even lighter?) than most makers manual start models.