Once you are able to fit the power pak on the controller properly , it works really well and does extend battery life a bunch. I bought two for both my dualshock 4 controllers. One fit right out of the box. The other did not. I had to gently move the connector so it in inserted correctly into the controller. I used a very small screwdriver to do so, as recommended by someone on youtube with the same problem. After some adjusting, it fit and worked perfectly. So because of this I rate the design not very high. I have no problem with access to the buttons on the dualshock 4 with the pak on. I have rather large hands and everything for me is easily accessible. I also like the extra weight it provides on the controller. I plan on buying another for my Magma controller when it arrives. With all that said this might not be for everyone. Especially someone with small hands and/or someone who might be afraid to make some adjustments on the power pak if need be for it to fit correctly. One more negative aspect is again with the design. That is the fact that you cannot charge the controller with the pak on most of the battery chargers out there. I have the Sony dualshock 4 controller and I have to take the pak off and charge it separately because both attached will not fit on this charger. However, I believe Nyko has a charger that can charge both together so that might be an opton for some that do not want to mount or dismount the pak every time charging is needed. I would recommend this because it looks and feels great on the controller and really increases battery life a lot.
yes: I recommend this product