I use RX-7 in 7.62x39 with 123 grain bullets, so a lot of my experience may not apply to your .223 and 55 grains.
The first thing I noticed was more muzzle flash than cheapie Wolf ammo. It burns clean compared to the Wolf stuff but I would not exactly call it clean burning, there is some soot on the brass, but nothing outrageous.
Meters real well, within a couple tenths as a rule. Loading for an AK and a mid-range load, I am not hand weighing each charge. Checked the first few then one in 10 and good to go.
The price on it is not bad, I paid $92 bucks for the 5 pounder pre-panic. It also works in several other calibers that I load but have not yet tried.