So do I. Yes it is :-)

And I have just bought their Sourdough Home, which is equally useful!

It's still unavailable on Amazon. But, Yes, it can be bought directly from B&T.

Good points, u/dcchambers and u/starliner2000!

I already have the B&T folding.

I said '…seems to be obsolete…' because on Amazon it's 'Currently unavailable'.

I bought mine in 2014. So I thought that maybe it was time to revisit how I proof.

Because of Challenger's high reputation (IMHO well deserved), I wondered whether theirs was an all round better solution.

But it does look - and thanks to all the informed replies here - as though it really isn't :-)