I didn't have any issues with my kit, as far as installation goes. I did have to send the charger back to the store I purchased it from. After I got a new charger, life was good until I managed to poke a couple of holes in one of the cells. I sent the battery back and they repaired it. I had to pay for the repair, apparently poking a hole in one of the cells isn't covered under the warranty

I think that it is more important to deal with a reputable shop. I dealt with Cycle9 I would highly recommend them. They are very knowledgeable and their customer service is awesome.