Is it worth it to visit the Czech republic? Well, my parents are Czech, I speak the language, so for me, yes, I'd love going there... but as to the question of going to the CR for the purpose of buying a Delicia, that's a little bit tougher of a question.
About 40 years ago, they didn't make very good accordions, except for the HLAVÁČEK models, which at least in my family, *everyone* wanted even if they did not play... lol The other accordions were generally of a bit lower quality than their equivalently priced competition. That said, quite a few people that I know say that they have really stepped up their game, especially in the last 5 or so years, but that can also be said of almost all manufacturers, so that's not a bad thing.
They're about a 45 minute drive south of Prague, and you can likely just walk in and not only get a tour, but if you buy, might even see someone putting together your accordion at the final stages, and then walk out with a brand spanking new accordion.
Bottom line, I would say, that they are a fair deal for the price. Not the best, not the worst, you get your money's worth, but before spending anything, it's always the best advice possible that if you can find a model locally that you can test personally, then do it. Czech currency is a bit of a bargain for people outside the country thanks to them having kept their Czech crown, not the Euro, so that is a very nice advantage, but the really nice thing would be to make it part of a small vacation, because Prauge is such a beautiful city to visit, and I find the people there just lovely. They also have the world's best beers there... you cannot beat that! :ch