I bought one to use with my 1050. It stinks breaking up your rhythm to go load primers. Sorry in advance for the long post.
Anyways, I love it when it works. No maintenance to my knowledge, no real moving parts. I have never switched it to large, but have taken it apart a couple times. If I had to guess it wouldnt take more than 5 minutes to switch it over. Loads primers very consistently when it works right.
Only had a couple problems with it.
1-it has somehow rolled a primer along on its side getting stuck and blocking the port a few times. Granted, it happened when it wasnt level or when someone else was playing with it. So I cant quite point the finger at the filler.
2-when I first bought it I ran a 100 primers through it repeatedly looking to see if any were going in upside down. Probably did this 15+ times before I gave it the stamp of approval. I left the primers in the tube overnight thinking nothing about it. My dad came over the next day and wanted to play around with it when I wasnt looking. He had probably 400 primers in the thing, it was overflowing and a big mess. One of the original primers left overnight managed to somehow adhere itself to the side of the tube to complicate things further. When I say adhered, I mean REALLY stuck. I could see light 80% around it, it was only adhered in one spot. Not wanting to jam something sharp to dislodge a live primer I tried banging the tube, turns out it was thin wall aluminum
. Long story short I bent up the tube getting the primer out like a coat hanger (looked like the primer had super glue on it, still unexplained to this day), and my dad ran a bunch of rounds without primers in my 1050 (while I was trying to troubleshoot the filler) leaving a huge mess of powder. A primer managed to get loaded into my 1050 sideways during all of this.
Granted the adhered primer was an isolated experience that I simply cannot begin to explain. I partially blame my dad, left me with a broken 1050 and filler. Other than that, it has worked out pretty well. I do not regret buying it.