I have the Hornady one. I check it regularly with my tuned up RCBS beam scale and it is good enough for me- it is very consistent. Only complaint is the very annoying beeper- but a little beeper-ectomy surgery fixed that. I've never used the RCBS, but IMHO an auto-thrower is a very nice luxury. Mine has been going strong for quite a few years and I'm happy with it- I'd buy another if this one ever bites the dust.
