The article contains the results of theoretical and empirical analysis of approaches and hypotheses that concern costs and benefits resulting from Poland's accession to the eurozone. Comparative analysis indicates that the bottom line results of Poland joining the Economic and Currency Union should be - in the longer run - advantageous. The path leading Poland to eurozone seems to be difficult because the country does not meet nominal and real convergence criteria. The fundamental problem is attributable to the need of deep reformulation of structural policy: modernization of state institutions and of the economy, improvements in policy mix are the main points. Poland should be well prepared and 'ripe' to benefit from opportunities ensuing from integration. Voluntary or too early resignation from the ability to conduct own monetary and exchange policies would not safeguard the stability of macroeconomic policy under conditions of contemporary challenges facing the world economy. The article is concluded with the statement that the integration with the monetary union should be desirable and, in the overall account, will bring benefits for Poland.