I have a Tentipi Varrie/Safir and a cheaper Helsport model (Rejnfjell (?) broadly same as Porsanger), so maybe the views of others on this forum about Helsports are more valid. You can see both pitched in my avatar. I found that my polycotton Tentipi is easier to dry out when taken down than my Helsport, since it will dry out "through" the material whereas the all-nylon Helsport "holds" the moisture and has to be moved a lot to dry out properly.
Both appear very well made.
On my Helsport the main anchor straps are under the skirt rather than on the edges of the skirt and the skirt therefore flaps around in windy conditions and makes the inside of the lavvu cold (or at least it did until I added pegging points to the skirt). I find fitting and adjusting the top hat a fiddle compared to the mechanism on the Tentipi. I also found my Helsport leaks around the main strap anchor points and condensation is a problem, despite the excellent venting.
I greatly prefer the chimney exit hole arrangements on my Tentipi (Varrie/Safir) to the simpler arrangement on the Helsport. I am also much less nervous with a hot chimney in the polycotton Tentipi than I am with the all Nylon Helsport.
The Helsport groundsheet that I got to go with mine was a disaster and in the end I chopped it up for other projects.
On the other hand the Helsport is much much lighter, to the extent that you could contemplate carrying it on a backpack between three of you. It's also good value for money compared to £1000 for a Tentipi Varrie.
NS