I have no idea if its good or not. It would depend on what they mean by "euro". Obviously, it is not a term used in Europe - a Euro, of course, being
currency. People in Europe call boxers boxers

Possibly with the country of origin appended (but rarely). LOL - using a ridiculous term like "euro boxer" here would be very much like someone saying a "dollar boxer" and leaving the uninitiated wondering which country's currency they were referring to
That may sound like its splitting hairs, but it really is NOT. The continent of Europe is a big place, with a great many different countries within or near it. There is absolutely no comparison between the mass puppy mills of Poland, Hungary or Ireland and some of the top kennels in Germany, for example. Even without mills in the equation (though you'd be foolish to ignore those - as that is where the vast majority of so-called "euro" pups exported to North America originate from), there are as many differences - and similarities - between boxers bred in different European countries as there are between those dogs and the ones bred in North America. Russia would be different again (though debatably not Europe anyway), and further typical differences exist in those bred in the South, such as Spain.
In short - 9 times out of 10, the mere mention of the gimmick-phrase "euro" boxer would have me running for cover (or another breeder). Before writing it off out of hand though, it is probably worth finding out exactly where the so-called euro dog actually came from. If its somewhere where you cannot check (don't have the language skills to check) the paperwork of the dog OR if it comes from a country where puppy mills are rife, then I'd pass. If you can determine that it has actually come from a reputable kennel, then maybe things are a bit different. Whatever the outcome, don't let yourself be swayed by the marketing hype, which you appear to be getting in large doses