I have a xl650 fitted with the full Mr Bulletfeeder in 9mm, .40, .45, .223 and the Minifeeder in 9mm, .40, .45. I've found that both have their uses.
True the tubes have to be loaded but additional tubes takes care of that issue. the real benefit comes from a number of points.
1. The mini feeder really does speed up reloading when you are looking at reloading <400 rds - too much time is wasted in changing out the calibre's to make the full Mr Bulletfeeder effective on small production runs.
2. The mini feeder prevents trapped fingers when you get enthusiastic.
3. The mini feeder is a very effective piece of kit for the price, and you definitely see improvements.
4. It definitely speeds things up if you are not as dextrous with the fingers as you once were.
One thing to remember is that the bullet feeder system takes up a complete station on the toolhead and the powder check alarm doesn't work with it.
If you decide to go with a full system then order the pistol calibre feed as there are 2x different spring feeder systems (large and small). If you buy the pistol the small and large feeders come together, if you just but the rifle feeder then you have to buy the large as an additional option. - Its all explained on the manufacturers website.
They have an excellent customer and after sales service - they are based in the Netherlands.
I bought all my gear from Doc Murray in BC and have had good support.
As for the primer system - i went with the RF100 from Dillon - when its adjusted then its awesome - but recommend standing it in a plastic tub to catch excess primers that fall out during the loading / unloading of the tubes.
So if you get the mini feeder then get additional tubes - you won't regret it