Here's a spa before and after for my Barenia HAC (1999 bag). It wasn't in tragic shape to start with, but it's much more even now, the spots are gone, and the scratches are much more blended in. There was also some corner wear you cannot see here that is now completely fixed. The tone is not as much darker post-spa as it may appear, that's mainly lighting, but it's good to know that in general Barenia WILL come back a bit darker (you can ask for the patina to be deepened, too).
The wonderful Docride also does Barenia work which has been very successful for some tPFers who don't have easy access to spa/don't want to deal with the delays/etc. (Just to clarify per a couple PMs, this bag went to Service Apres-Vente at a boutique in Paris, where I live. Took just under 3 weeks to get a quote, at which point I was quoted seven weeks for service, but it was only another 4 weeks before it came back.)
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