The game has been downloaded and set up by over 1M users and its most recent update is dated Feb 2, 2016. Some in-app purchases and advertisements are included into this application. Samsung and LG users like the app.
A free .apk installation package of O2Jam U 188.8.131.52 can be downloaded from Droid Informer and you can have a look at users' reviews on this site. Prepare 56 MB of free space on your device for this app installer and keep in mind that it runs on Android 2.3.3 and higher.
As users see it, you can notice such advantages of the app as a nice UI, good performance and constant updates. Users leave reviews saying that you can find sync issues, annoying ads and a battery drain among the disadvantages of this application.