I have been using a Sodium version of Rodinal for over a year now. No crystals, no loss in activity. If I can find the formula I wrote down (I know I wrote it down somewhere!) I will post it.
I mix everything myself these days, except for rapid fix. The last bottle of Rodinal (or whatever it was called) ended up having huge crystals in it which was disconcerting. I decided to make a Rodinal replacement so I don't have to rely on any of the different versions that are out there. I sure wish Agfa was still around. Never had an issue with their Rodinal.
I think Ian was going to do a big treatise on Rodinal. I anxiously await it.