Unblock Tech TV box is a pretty good box. You buy their product basically for 2 apps the servers of which they maintain well the past 4 years. One is the UBTV which you use to view close to 1000 live TV station relays. The other is a Uvod, or a video on demand app which you would use to view movies or stored TV serials, including a wide storage of adult stuffs. The is no visible difference between the hardware specs of Gen 3 and Gen 4. Except that the Gen 4 allows the viewing of what is shown on the TV on your mobile phone. Personally, I would recommend the Unblock Tech TV set box. Don’t have to worry about live tv apps expiring....at least not yet since their sets are still selling so well. If any of the given apps doesn’t work well, just reinstall it via the app market which comes with the set. That should do the trick.