Opera mini is a web browser. Like other many web browsers, this web browser is also having a good interface. The browser is quite good in terms of browsing but it is worst in case of downloading. The browser can only download files upto 10 MB ( as per my observation) . The downloading speed is just very bad. Even if you are using 4G internet, the speed is still slow.
Also in case of browsing the browser is not very good. Sometimes it takes a lot of time to even open facebook, rest we can imagine what could be the situation with other sites.
Although the developers of this app are doing well but my only advise tk them are that they must work on this downloading issue of OPERA MINI and please do something and must speed up this browser because I know that this browser is one of the oldest browser, coming from symbian mobiles upto android and also in blackberry, IOS and even it is in Windows. So I think that the app developers must think about this app and make the desired changes in it.