Any opinion on this kite ?
Naturally. The search function is your friend here. Narrow it down to the Reviews section while you're about it.
I heard there is no tail weight on this kite.
You heard correct.
Who is selling it and how much when new ?
As mentioned before the maker, Windfactory, is sadly no longer with us. £235 for a regular STD, £260 for the Aerostuffed version, both of which weren't unreasonable for what you got.
I google the Maker of the kite(Windfactory) but can't find anything. Is it out-of-business ?
All that you'll find is via The Wayback Machine
and that's not much.
I think FA used to sell this kite a year ago.
It entered the shop in December 2006.
It remains the
kite I reach for when the wind is right. Lovely technical
flying - does more than I can. The UL that I picked up is "just" a reduced frame weight version.