However smaller, I own and sail a Sirius 310DS delivered to me new in april 2019.
I have been aboard all variants of Sirius. The difference between 35 and 40 is far bigger than from a 310 to 35. On the 40 you can pass others in gally without feeling them up ;-) It feels a proper ship and I would not manouver that without thrusters. (I have none on my 310).
Since I sailed her home from Germany
I have not been outside Norwegian waters, yet I have 2200nm so far.
Everything is so well thought out and built with passion for details.
The standard selftacker and mainsail
will leave you underpowered below 6-7m/s upwind and 9 m/s downwind. I added a code-0 for lightwind sailing.
The boat is heavy and will never plane, it will get me to my destiantion safely, warmly and in comfort.
I did choose the twin 1.35m deep keels. And to my surprise I cannot go longside on many places and quays because the keel
is 1.35m deep maybe 30-40cm from the boatside.
Sirius delivers around 20 boats pr year, that is 310`s, 35`s and 40`s combined. So small numbers and very much a yard to customer experience. You get what you want and pay what it costs. It is simple as that. I doubt you will find a Sirius owner in this world that has bad words about his boat or the customer service