We were lucky enough to have a bottle of 1994 Tondonia Blanco GR the other day, courtesy of Richard Zambuni. It was quite glorious. I was wondering if the difference between GR and R is more pronounced in the whites, as I've had the Reserva a few times and it didn't seem close in terms of quality. Having said that, we once had a GR (at a Rioja event at 28-50) that wasn't showing as well as the R. That could have been down to its poor treatment - I had to cycle madly from the wrong restaurant to the right restaurant with that wine in my bag. I know it's quite expensive now, but I'm seriously considering going for the next vintage whenever it comes out.