Has anyone had any experience with this Wollensak 90mm f/ 4.5 Enlarging Raptar lens:

Wollensak 90mm

I have a 75mm YSARON which is OK for 6x6, but hope to move up to 6x7 some time in the near future.

Would it be a good investment? Is it possible that it would cover 6x9?

Thanks,
Matt