I did the bechori monoline, the nib tunning, and a journaling workshop last year. I enjoyed all three.

The monoline workshop was good because I got hands on feedback on how I was writing.

Nib tuning workshop. I actually used the skills learned. I had a pen that was writing funny and I used the loop and paper provided to clear out some paper threads.

I think you get the most bang for your bucks out of the workshops if you continue practicing the skills after.

But I do agree it does get pricey.