It should be 49 or less at this point, since I put my order in for a signature Isis a week ago.
Is it worth the 195 pounds? That is up to you. I just received my first "Cool Blue" Isis (as well as a Kuku and Iball3) on 12/27. I have all of the clues decoded, made some progress (I think) but not quite there yet. My Isis remains closed. I'll get it eventually.
Why order the second puzzle already and pay 195 pounds? Because I am absolutely thrilled with the quality of the Isis and Kuku. Puzz definitely knows what he is doing (IMO). These aren't just simple trinkets. More like works of confounding art. I KNOW I am going to want to get all 5 of the puzzles eventually. Might as well join the queue for the 2nd puzzle ASAP.
Just my thoughts/opinion of course. But one man's reason, anyway, for placing his order.