Service app does make a difference and is worth doing. When I was using an E2 box I had problems with US channels on IPTV not playing correctly, stuttering etc and service app solved this, I switched to exte3player. It also helped with the general playback of all other channels. A lot of people on here have installed serviceapp and had an improvement to their IPTV, so you have nothing to lose.
Just make sure you do a backup of your current setup, so that if you are not happy, you can easily re-flash the box back to your original setup.