I just purchased the RCBS 1500 a few days ago. I have only loaded about 100 rounds now, but I like it so much that I just sold my Uniflow Powder Measure. I can't imagine going back. I did keep the beam scale for periodic checking.
So far the weights have been right on. The two things you will find that people are complaining about are maybe speed and sometimes an over-throw.
There is a fix for both.....the speed thing is not a real issue as it usually has thrown powder for the next round by the time you have seated a bullet. However, if you find you are waiting a few seconds for the powder to be dispensed, then there are some program settings to speed that part up for you. I haven't tried the settings yet, but I plan on it as I do need to speed it up a little.
For the over-throw problem...I didn't get any, but I can see how you could with the trickler. However, it has been posted that if you insert a McDonalds drinking straw into the tube to eliminate the screws, it will reduce the overthrows to a minimum....I haven't needed to do that yet.
Either way, the two issues are really ticky tack things that can be resolved. Don't let those get in the way of your decision....I almost did.