So, I'm currently in Riga, arrived perhaps some five hours ago from Lithuania. Here's some input on how things are going regarding the new currency:
Having hitchhiked to some place to Ogres direction from Riga's downtown, I took a bus. After causing some confusion accidentally speaking to the driver mostly in Lithuanian and only partly in Latvian when trying to ask if the bus is going to the central station, I asked for the current price of a bus ticket. One euro, the driver said. I gave him two 50c coins, to which he replied "you must pay in euro". Apparently the spanish 50 c coins I had in my pocket and that happened to land on his "table" the national side up, were unrecognizable to him. I then took the 50 c coins back and gave him a 2 € coin (Portuguese) instead. He turned it around in his hand a couple of times, trying to figure what on Earth the piece of metal in his hand was, and then gave me five 20 c coins back as a change. And after a while, also remembere to print the actual ticket
You can imagine, this wasn't the quickest possible procedure
A while later, I ordered something to eat in a café at the outskirts of downtown, where tourists seldom end up. Since the products I bought cost altogether 4,05 €, I Paid with 20 € note and 5 c coin. The worker also had to look quite carefully at the coin to figure out its worth. Somehow all of this is kind of cute, although definitely understandable. I didn't notice anything like this when the Euro was a new thing in Finland, probably because I was so confused myself that other people's confusion wasn't anything out of ordinary for me
Also, I've gotten altogether 13 coins as change by now. Two of them (a 1c coin from a cafe and a 10c coin from another cafe), have been Estonian, the rest 11 Latvian. Actually quite interesting seeing how the Estonian coins have made it to parts of city outside the touristic areas in such a short time
EDIT: A cafe had run out of small notes, so instead of 5€, 2€ and 20c what I got back was 2 €, 4x 1€, 2x 50c, 2x 10c. Of those, one 50 c coin is Estonian and one 10c coin French. (Not sure if the French one is one that I brought here myself. But, for what I remember, my coins weren't as shiny as that one)