I installed this today, I watched the video which was super helpful. Installation was a snap, literally, and you don't need to take the door off the unit to install. Had a little trouble reaching the inner retainers on the old unit but used a screwdriver to reach the clips and they popped off easily. Love it!

These actually lasted a really long time. The tablets held up well, it only took a couple in the chlorinator at a time and they lastest at least as long as anything from the store, maybe even longer. Or maybe it's because the 50 lb bucket is still a 50 lb bucket instead of shrinking to a 35 lb bucket...